Raypak Heater Fault Code Guide

No one likes to get an error code on any piece of technology, especially on a Raypak heater. It means something is wrong and needs to be addressed soon. The panic really doesn’t set in until you realize error code BD1 means absolutely nothing to you. Error codes are both curses and blessings. Although an error message is never really a good thing, at least it’s an indication of what the problem is. Just imagine how much easier it would be to diagnose diseases if humans came with error codes.) Usually, depending upon the manufacturer, the manufacturer will include a manual detailing what may have triggered the error message and possible solutions to fix the issue. All error code guides are not made equal.

Still, even if the error codes were listed in the manual, what are the odds you know where that manual is? Unless you’re like my mom who keeps all her paperwork in a filing cabinet, the manual was probably tossed a week after your product was working properly. Heaters, though, can be rather tricky without the manual. I love the saying, “hindsight is 20/20,” because it’s so true. How many times did you wish you kept something after you have convinced yourself that you didn’t need it and threw it away? Or maybe it’s just me.

Our goal with this blog is to aid you in identifying and defining the error code on your Raypak heater and to provide possible solutions, as per the manufacturer. If we don’t have a solution or do not address your particular issue, it’s always best to contact Raypak directly.

The majority of Raypak heaters will have a digital readout. The digital readout helps pool owners read error codes on the actual heater. The models with digital thermostats are programmed to display a variety of status and diagnostic messages, depending on the operating conditions.faultpicRAYPAK

They are also equipped with onboard diagnostic controls. If there is a safety fault, a fault code will be displayed along with a service indication. (see pic on right) The word “SERVICE” will flash on and off if the PC board detects a known issue. The fault code is displayed in 3 big letters in the lower left of the display.

Below is a chart we created to help pool owners identify the meaning of Raypak’s fault code. It also includes possible solutions to fix the issue. Keep in mind, this is not a substitute for the installation and operation manual. Should you need further advice or technical information, please give Raypak a call at 805-278-5300.

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310 responses to “Raypak Heater Fault Code Guide”

  1.  Avatar

    Trying to find out what code TA6 means on my pool heater

    1. Matthew Simmons Avatar

      What is the model number of your heater? The answer of what the TAb code means can vary depending on the model.

      1.  Avatar

        is it possible to fix a raypak heater with a tube bundle?

        1. Matthew Simmons Avatar

          Yes, but only if the tube bundle is the issue, to begin with.

      2. Debra Becker Avatar

        P-R406A-EP-X
        Giving a digital reading Water SW open and then shuts off can you diagnose and possibly give solutions to rectify situation thank you Debra Becker
        Email: debralynnbecker@gmail.com
        Cell:(631)942-4871

        1. Matthew Simmons Avatar

          This is a copy and paste from a couple of other posts asking this same question in the comments below:

          The Raypak manual states this in its troubleshooting section: Pressure switch. Verify water flow and pressure CLEAN FILTER / STRAINER – backwash if necessary

          Make sure your pump is primed and your filter and baskets are clean.

          1. Scott Avatar

            I have a fault code that says “Rollout SW Open”. Any thoughts

          2. Matthew Simmons Avatar

            From the Raypkak manual:

            Roll Out Sw Open – Rollout Switch – verify gas pressure, combustion air, blocked heat exchanger, proper vent size/connections, high wind conditions.

        2. Wayne Avatar

          That is the pressure switch. Backwash the filter throughly or clean the cartridges and try it again. It should fire, but may need the pressure switch replaced.

          1. Larry Lees Avatar

            filter clean pressure switch replaced still getting a pressure code ?

          2. Matthew Simmons Avatar

            Try to inspect your plumbing to see if you actually are suffering from low water pressure. How to Correct Low Water Pressure in Your Pool System

            Outside of that, I would see if a Raypak tech can inspect the heater.

      3.  Avatar

        I just replace my roll out switch now my heater is working but there is no enough fire to heat tje water.look like it’s in pilot because tje flame is too small

        1.  Avatar

          Pu output failure??

          1. Matthew Simmons Avatar

            I believe that is a PV output error and not a PU code. The PV is referring to the Pilot Gas valve, and that code means: “Pilot gas valve output is not in commanded state.

            The PV code is mentioned a couple times in the article and is usually associated with another code. I would check that the command module is receiving power and operating correctly, then you can move onto the valve for troubleshooting. This can be a little tricky, so I suggest having a tech do the work if you have not worked with gas and electricity before.

      4. Chris Avatar

        I have a “Rollout SU Open” message. Any clues?

        1. Mary Avatar

          Easy part to replace! Buy on Inyo – Raypak Thermal Fuse – 005899F

        2. Matthew Simmons Avatar

          There is no “Rollout Su Open” code that I could find.

  2. Lisa Avatar

    I have a SNScode on my Raypak 266A heater. But no ‘service’ code showing. please advise

    1. Matthew Simmons Avatar

      Lisa,

      Charlie covers that in the last portion, it is likely a bad temperature sensor; the sensor is reading it is out of an acceptable range for the heater to operate. Temperature Sensor, IID Units – 009577F

      Recommendations for a fix:
      1. Water temperature is below 36F or above 110F
      2. If the two thermistors are more than 2 degrees apart, the SNS code will appear.
      3. Loose or corroded connection at P1.
      4. If the sensor is not mounted all the way into the JACO fitting on the header, it may give a false reading.

      1.  Avatar

        I have a 266A with a “sensor failure” error code. Where are the thermistors located? Are they the same as the hi limit sensors? Is the “sensor” the Temperature Sensor? Are there 2 of them? The display panel does read the water temperature accurately.

        1. Matthew Simmons Avatar

          You can get an idea of the location of the sensors from this parts listing: Raypak Atmospheric Digital Heaters 206A-406A (11/01/04-Current)

  3. John Avatar

    Is this easy to change mine just came on to or is this a tech. job if so how long should it take them to change it ?

    1. Matthew Simmons Avatar

      I suggest hiring a licensed heater technician to complete any work because heaters can be very dangerous if not properly serviced.

  4. Kyle Avatar

    My heater is reading CFH…this is not in the code definition

    1. Matthew Simmons Avatar

      What is the model number of your heater? Also, what year was it installed?

      1.  Avatar

        My heater is a model 406a and also has the code CFH

        1. Matthew Simmons Avatar

          CFH is a normal code, which stands for “Call For Heat.” The CFH should display right before the SPK (spark) code displays, which means the heater is attempting to ignite.

          1.  Avatar

            What can you do if it still states Flame w/o cfh? How do you fix it

          2. Matthew Simmons Avatar

            So is the CFH not flashing on the screen? Are you not hearing to pop ignitor? What exactly is happening?

          3. Wes Avatar

            what if it keeps clicking to ignite ? I have a a266 model

    2. Ricardo Gonzalez Avatar

      That is Call For Heat, heater is starting flame rectification process and is in the way to achieve temperature set point indicated – Ricardo Gonzalez – Raypak Training Mgr – Domestic and International

      1. Dan McCutcheon Avatar

        Hi Ricardo –

        First time here…I have a Pentair Easy Touch with a Raypak heater (207A-407A). Everything on the automation end seems to be working. When the set point for the pool or spa is higher than the current water temperature, the LED on the heater turns on as if it is getting ready to fire up. But in both cases, it says “Remote No Demand”. If I take the heater out of remote mode into pool or spa mode, I can get the heater to work every time. Any ideas why is won’t turn on using Pentair Automation?

      2.  Avatar

        Svc tech here in buffalo, ny. Pr130enc has valve does not open. How do I test?

        1. Matthew Simmons Avatar

          Are any lights that are blinking on the Ignition control box? You could try testing for voltage at the gas valve when the igniter is sparking. It should be sparking for five or six seconds.

    3. Ricardo Gonzalez Avatar

      call for heat, pool water temp drops 1-2 degree below setpoint, unit will ignite

      National/International Tech Trainer Raypak

  5. Dan I. Avatar

    I’m not getting any codes, but heater runs for only 30 seconds or so, then quits and starts right back up and repeats. Showed up about the same time as a leak appeared. Related? Any ideas? Thanks.

    1. Matthew Simmons Avatar

      There could be a low water flow issue causing the heater to shut off to protect itself. Or the heater may need to be cleaned, ash and soot can build up in the burner tray suffocating the heater.

  6. Gayle Avatar

    My heater model no is P-R336A-EN-C, the digital panel shows “SENSOR FAILURE” what’s wrong?

    1. Matthew Simmons Avatar

      I’m going to go ahead and take a wild guess the issue is stemming from a failed sensor. haha

      But to be more specific it is likely a water temperature sensor problem, it is reading the water temp either above 110 degrees F or below 36 degrees F. Usually, the sensor failure error code is SNS. the temp sensor for that unit is part number 009577F.

  7. Mo Avatar

    ROL code shows on my heater as well as service is blinking, what o need to do?

    1. Matthew Simmons Avatar

      This is actually mentioned in the blog:

      ROL – Thermal fuse tripped inside heater due to excessive heat or flame roll-out detected.
      1. Possible downdraft of burner flame. If sensor has red reset button, press button & determine cause.
      2. Does your unit need a high wind stack?
      3. Check wiring for burns- especially the ground wire and wires at gas valve.
      4. Replace wires if necessary.

      1. Espo Avatar

        Where is the thermal fuse and the red reset button? thanks

  8. Mo K Avatar

    ROL code shows on my Raypak heater as well as service is blinking, what do need I to do? and how to fix it

  9. Mo K Avatar

    Model # P-R265-BL-EN

  10. emmanuel marin Avatar

    mi calentador no es digital es modelo p-d106a-ap-c, el probema con el es que no calienta como al principio solo deja el agua a baja temperatura, cual es el problema ,revise el interior y no tiene oyin que lo sofoque

  11. Heather Avatar

    My unit is saying high limit 2 fault. What does that mean?

    1. Matthew Simmons Avatar

      Heather, it is in the blog, the code HL2.

  12. Anh Avatar

    Hi. I have a raypak p-r406a-ep-c propane heater. It is flashing CFH. I turned off the power for 90 seconds and restarted. It will try to spark (spk) but nothing happens. Then goes back to CFH. Thanks for any help.

    1. Matthew Simmons Avatar

      Is your heater hooked up to an automated control or remote system?

  13. Bill Balthasar Avatar

    I have a raypak p-r266a-en-c ever since I replaced the pilot assembly after I turn it on it sparks then pilot lights then CFH the burners all light with strong blue flame then quickly shuts off. It then repeats this cycle for unto 60 minutes before the burners stay lit. do you thinks I got a bad pilot assembly or is there another sensor that is keeping the burners from staying lit.

    1. Matthew Simmons Avatar

      CFH is supposed to display before a normal ignition cycle. Are there any other codes that flash before the heater shuts down?

  14. Rol Avatar

    I have a Rheem M366A that is displaying, Flame w/o CFH. I just finished rebuilding the burner box and replaced some burner tubes. The heater has worked fine for a month and now shows this on the display.

    1. Matthew Simmons Avatar

      According to Raypak, it could be a bad board/control module. And in very rare instances, it could be that the gas valve is being over-pressured keeping the pilot light lit when it shouldn’t be.

  15. Tom Avatar

    I have a Raypac model8350 led reading LP , heater was working fine had tech by to check my pool temp sensor going to my pentair touch unit he told my wife sensor was fine even though it was reading 104 degrees in the pool that was actually 88 . Said one of the wires in touch unit was rusty and cleaned it and the temp then read 63 10 minutes after he left heater stopped giving heated water , 4 hrs later got the codeLP

    1. Matthew Simmons Avatar

      According to Raypak’s manual the LP & LP3 error code means the following: “Shortage of refrigerant gas in the unit or faulty low-pressure control. The unit will show (LP3) after 3 LP faults and shuts down the unit and pool pump for protection. If this occurs, you should call for service.”

  16. George Avatar

    I have PRS code clean filter heater won’t start. I already backwash filter, pressure now normal but heater still won’t start showing the same error

    1. Matthew Simmons Avatar

      George, you should have a technician come take a look at the heater. Or at the very least call the manufacturer.

    2.  Avatar

      Pressure Switch. Filter is clean that’s good. Pressure Switch is at fault.
      Call a technician. After replacement new switch must be adjusted precisely.

  17. Anthony Avatar

    what does F52 mean?

    1. Matthew Simmons Avatar

      What is the model number of your Raypak heater?

      1. Edd Avatar

        I got the same code, muheater is R5350ti-E

  18. dennis Avatar

    What does “SPK” mean on my Raypak P-R405BL?

    1. Matthew Simmons Avatar

      SPK is a status and not a fault code for “Spark” on the Raypak PR405BL. The code only notes that the heater is attempting to spark for ignition and does not denote an error has occurred.

      1. Alan Avatar

        I have the same model PR405BL and same message…When I flip the switch it reads RV 0, then CFH, then SPK as well as showing a pic of the flame and the spa temp that I set it to. (104) It clicks once and that’s it. I don’t smell any gas and nothing else happens.
        I cleaned out everything on the heater as well as backwashed and cleaned the filter.

        Any suggestions on why it won’t start and how to fix this issue?

  19. Edd Avatar

    R5350ti-E, what does F52 mean?

    1. Matthew Simmons Avatar

      I found an R5350ti-E owner’s manual but it does not list the FS2 error code. It does show an FS error code that explains it is code for the heat pump’s defrost cycle. The fan will spin but the compressor is shut off.

  20.  Avatar

    I get a Sw open default. The manual states it is a Water Pressure switch open.
    Now what? Can’t find what to do about it in the manual.
    Thanks!

    1. Matthew Simmons Avatar

      The Raypak manual states this in its troubleshooting section: Pressure switch. Verify water flow and pressure CLEAN FILTER / STRAINER – backwash if neccessary

      Make sure your pump is primed and your filter and baskets are clean.

      1. Jeff Avatar

        I have a 266A with the same sw open code. I have done all you suggest and it will not clear the issue. What next?

        1. Matthew Simmons Avatar

          Call a professional to come take a look at it. Or contact Raypak directly for some ideas.

  21. Pooldok@aol.com Avatar

    Raypac heater P-R407A-en-G S/N 0707003973 error code PA6. What could be the problem

    1. Matthew Simmons Avatar

      Hello Pooldok, are you sure that is the correct code and model number? I searched PA6 in a few manuals and come up with nothing. Also, the model number ending of “G” is not a usual number, it should be a “C.”

  22. Ryan Avatar

    Ignition failure Raypak 266,000 btu.
    I hear clicking but no ignition, could this be a bad ignitor? Heater is 2013

    1. Matthew Simmons Avatar

      Best guess: The burner near the ignitor might be clogged. If you hear the ignitor attempting to spark but there is no flame, there might not be enough gas or air to make for proper combustion. That is something you should have a professional come out and take a look at, for safety reasons.

  23. Bert Avatar

    I have a LoNox Tab Fault in my Raypak P-R406A-EN-X. I already reset factory defaults and cleared fault codes, but error keeps reappearing. Low Nox Tab is not broken and I know the manual says that “If TAB is NOT broken and the board detects power at Lo NOx connector, Lo NOx Tab Fault is displayed and the heater will not operate”. Manual does not say how to fix this. How do I fix this/make sure board does not detect power?

    1. Matthew Simmons Avatar

      The TAb code with a LowNox unit means you have to replace the main board.

      1. Christina Avatar

        I just installed a new pc board and have gotten this code upon startup

    2. ChrisH Avatar

      I am getting the same code (LoNox Tab Fault). Were you able to diagnose how to fix this issue?

  24.  Avatar

    I have a customer with a raypak heater that has a code that says either water supply or water switch open. Is that a pressure switch problem? It hasbeen backwashed and put on recirculate to test unit.

    1. Matthew Simmons Avatar

      Well, let’s start with basic info like what model heater your customer owns.

  25. Chris L. Avatar

    Raypak heater turns on, when turning on the heater after winter it just sparks and doesn’t ignite…please advise.

    1. Matthew Simmons Avatar

      Are there any error codes? Do you smell gas?

  26. Kevin Kelly Avatar

    Matt,
    Raypak 336A gas heater. Unit in service for 10 years. Getting code “no pilot sensed ignition failure.” Pilot sparks for minute or two like it wants to light but will not and I get the code and pilot continues to spark. Any ideas for me? Low/no gas supply from clog maybe? Yes, there’s gas in the car (gas supply turned on).
    Thanks

    1. Matthew Simmons Avatar

      Kevin,
      You may have a pilot or gas valve problem. The parts breakdown for the heater is listed here: Raypak Atmospheric Digital Heaters 206A-406A (11/01/04-Current) I have seen a few DIY-guy solutions for this, but they seemed a little dangerous to me. I suggest you call Raypak to see if it something you can tackle safely under their supervision. Raypak Tech Support – (805) 278-5300

  27. ALB Avatar

    I have a Raypak 406A pool heater. After ignition and flame an “low voltage” error displays on digital panel for the duration of operation. No explanation in manual.

    1. Matthew Simmons Avatar

      Have you tested the voltage of the power lines on your heater’s circuit? That would be my first step.

  28. Art Avatar

    My heater is a model 406a has the code CFH the pilot light is lit but the burner will not come on

    1. Matthew Simmons Avatar

      Does the SPK code display after the CFH?

      1. Leonsrdo Avatar

        No aparece solo se queda en CFH pero si enciende el piloto

  29. Leann Avatar

    What does an internal fault message mean? And the pool temp is only reading 36f when it is more like 78f

    1. Matthew Simmons Avatar

      What is the code that is being shown on the display? The code will only be three letters long.

      Going by the 36-degree reading, and the time of year I would say something is wrong with a temperature sensor. But that is a guess until we get more info.

      1. Jeff Avatar

        I don’t get a code ether
        My unit is set for 85* but as the unit is heating it stops at 81* and flashes internal fault and won’t heat any more
        just had mother board replaced this summer

        1. Rob Avatar

          I am seeing this same issue (internal fault with no error code). How did you resolve it?

  30. Alan S. Avatar

    I have a Raypak 336A and I am getting a CLK message. I don’t know if it is wired through the pump timer but the pump is running.

  31. Matthew Simmons Avatar

    The CLK fault code means “Clock – Time Clock. Heater is off by programmed control of a Time Clock.” Is your heater controlled by an automation system like an InteliTouch or Aqualink

    1. Alan S. Avatar

      No. I’ve tried resetting to factory default and “re-booting”. CLK keeps coming back.

      1. Matthew Simmons Avatar

        Then it could be a PCB issue. Unfortunately, those ignition controls are expensive, 013464F. You may want to try calling the manufacturer as a list ditch effort before plunking down cash for the part.

  32. Marty N Avatar

    I have Raypak (Rheem) 266A that is nine years old and I have my manual but it does not show fault code TA6, can you help?

    1. Matthew Simmons Avatar

      The TA6 is actually a TAb code. Is the TAb code alternately flashing with any other codes?

  33. Jeff Avatar

    Hi I have a raypak model p- m206a-en-x . I had error code of sensor had burnt wires and repair turned on and it ran . Then turned on in morning and unit would run and then error of ta6 and fan codes are coming up? Any ideas of what to look for? Thanks

    1. Matthew Simmons Avatar

      The TAb code alternating with a FAN code means there is either a bad air switch.

  34. Marc Avatar

    I have a Rheem Electric Heat Pump M8350TI-E. It reads DEL. What does that mean and how can I fix this issue. The unit won’t operate. Thank you for your help.

    1. Matthew Simmons Avatar

      I have looked everywhere, and I cannot find that code. I have looked for Rheem and Raypak manuals and they have nothing on this code. It is very strange. You may need to call Raypak.

      Honestly, if this was a slower part of the season I would give a call myself, but the pool season is in full swing for me. If you get an answer, please post an update.

  35. Jo Avatar

    HI can you help me

    1. Matthew Simmons Avatar

      Possibly. Did you have a question?

  36. Frank Avatar

    My Raypak control board is reading VNT and SERVICE in top right corner? I believe this means there is an issue with the Vent switch but not sure how serious this is?

    1. Matthew Simmons Avatar

      VNT code means the vent switch is open. The manual does not show too much information about it. They only state to turn off the heater at the breaker, turn off the gas and power; then call a technician.

  37. AJD Avatar

    I have an RP2100 works fine but the temperature setting went to 104 and I can’t adjust it down. Heater seems to work fine, I have to turn it off when it reaches desired temperature. Do you have any idea which part or parts could be bad?

    1. Matthew Simmons Avatar

      I’m not a heater tech, but that sounds like you have an issue with the hi limit switch or the thermister. You probably want to give a call to the manufacturer just for a quick troubleshoot.

  38. Bobby Avatar

    Hi Matthew, I have a raypak 266A pool heater with no error codes. It makes a squealing noise when heating. Not at first, but 30 seconds after ignition. What are your thoughts on this?

    1. Matthew Simmons Avatar

      There may be a deformation of one of the gas orifices or the gas line causing the squealing noise. Kind of like when you purse your lips to whistle.

      To check the line, you need to get a professional out there to take a look.

  39. Pabman Avatar

    I have a Raypak 2100 unit which is 12 years old , I have replaced the control board but it would seem that the first problem was the switch on the side.
    So I finally have a code R1/ 1 exactly like that , what does that mean it then shows the water temp but off and I cannot change the state.
    can anyone help

  40. Matthew Avatar

    Mr Simmons, thanks for all the info; you’re a huge help. I have an issue with my Raypak pool heater (r206a) and hoping you can help. Unit lights fine, gas burns evenly: However when the unit gas feed “steps up”, it kicks in a horrible jack hammer like sound, like it’s trying to ignite gas that’s already burning. And it’s not every time, it’s sporadic. I get no error code, system just says heating. At a loss on this one. Thanks!

    1. Matthew Avatar

      Anyone have any ideas on this issue? Thanks,

      1. Matthew Simmons Avatar

        Everything I have read leads me to think it is a water flow issue. the jackhammer or knocking sound could water boiling inside the exchanger. Obviously, not good. This may be caused by scale, bad bypass valve, pipe blockage. Because I am not a licensed tech, I couldn’t tell you safely check your heater, so I suggest calling a service tech.

        By the way, cool name.

        1. Matthew Avatar

          Yes! Great name, ha ha. Just a follow up. The sound emanates from the gas valve itself. I’ve seen all kinds of weird valve issues in my life but this is a new one. Anyway, thanks for the response. I should have went with hayward, ha ha.

  41. Jeremy Avatar

    I have a gas Raypak RP2100 R265 that is about 10 years old. I recently replaced the heat exchanger with no issues. I go to turn the heater on and there is no reading on the digital display and the unit does not spark and light. It appears as if there is no electricity to the unit. Are there fuses on these heaters?

    1. Matthew Simmons Avatar

      When you turn on the heater, does the breaker flip? Do you hear any noises like clips or hisses?

      The only fuse I see is the Thermal Fuse, part # 005899F. According to the manual, “This is a “single-use” type fusible link or thermal fuse, that must be replaced when disabled by an over temperature condition, caused by excessive restriction in the heat exchanger flue passage.”

  42. Karen Y Avatar

    Hi
    My electric heater immediate flashes off when the breaker is turned on. When I try to turn up the temperature, it either flashes r25 or lets me click it up to desired temp but then goes back down by itself. It is sporadically working. It is model R410A

    1. Matthew Simmons Avatar

      R410A is the standard type of freon used in air conditioners and heat pumps, it is not a model number.

      Also, because it is a heat pump, the codes will likely be different than the ones for a gas heater.

      1. Karen Y Avatar

        It is R5350TI-E
        Is this blog only for gas?
        Thank you

        1. Matthew Simmons Avatar

          Karen, this article is for Raypak’s RP2100 Series, gas heaters only if you want codes for the Raypak Heat Pump, try this owner’s manual.

  43. Lisa Avatar

    My heater says revision 1.03 when I turn it on. Does not ignite or give any other code. I can’t find this code anywhere. raypak heater digital panel purchased 2015. Model number M266A

    1. Matthew Simmons Avatar

      That seems more like a firmware version instead of a code. if there is no code, no code and the heater still isn’t firing, you may want to try calling the manufacturer for their suggestion or having someone onsite to inspect the heater.

  44. Chris Avatar

    Hello,

    I am having a problem with my Raypac 206. The temperature was reading 207 degrees (No Demand), but obviously the spa was not 207 as it was more like 50 degrees. So I thought it was the Sensor and so I replaced it…. no changes…. so I thought it was the circuit board…so I replaced it…. no change….

    Anyone know what could be the issue?

    1. Matthew Simmons Avatar

      Chris, at this point you have replaced the two things I would have suggested. I think it is time to stop guessing and have a technician look at it in-person. There comes a point, where guessing what the issue is is costing you more than what hiring a technician in the first place would have cost.

  45. dean Avatar

    i have a raypak pool gas fired with a code w/o cfh and the ignighter not turning on ive never seen this code before been a tech for 20 plus years has me stumped must come to conclusion

    1. Matthew Simmons Avatar

      This is the only code I could find with the “w/o” in it:

      Flame w/o CFH – Pilot flame detected with no Heat Demand. Control Remains locked out until flame is not present. Gas valve (pilot) may be stuck open.

      1. Dan Gawkowd Avatar

        what does that mean though? And how can i fix it?!? I’m getting that same ‘flame w/o CFH’ error. I’ve read numerous places the same description you quoted, but no answer as to what exactly that means or how i’m supposed to fix the issue?!? Is it dangerous if the pilot is stuck open? If so or if not, how can i fix it, or do i need professional help? Mine happened when i turned the heater on and then shut the pump off for a second. I quickly contacted my pool builder, he suggested shutting it off for 20 minutes and trying again, but i left i about an hour and still no good?!?

        1. Matthew Simmons Avatar

          It’s dangerous if you do not know what you are doing. Get a professional to take a look at your heater. Pool heaters with open gas lines, faulty equipment, and a novice poking around can lead to an accident.

  46. Carflea Avatar

    What does PLT mean? Rp2100 digital

    1. Matthew Simmons Avatar

      The PLT fault code on Raypaks is acknowledging a pilot failure. This can be fixed by replacing the pilot, or you need to clean the orifices and burners. Call a local service company to come inspect and correct the issue.

  47. Ed Avatar

    What if nothing at all is showing up on the display?

    1. Matthew Simmons Avatar

      Have you checked if power is reaching the heater? Does the heater turn on?

  48. Dave Avatar

    I have a rollout switch open code on my heater model number cr-406a-en-c
    I understand this is a flame issue and am wondering if there is a possible reset I can do to see if the message goes away. We live in Las Vegas and it gets quite windy here and wondering if maybe that caused the issue.

  49. Dave Avatar

    There doesn’t seem to be a reset button unless it is under the cover where you turn the valve on and off but it seems to take a security torx fitting to remove it. Thanks

  50. CHARLY Avatar

    HELLO MY RAYPAK MODEL H-1262 MARK ERROR LWCO, THE KEYS ARE OPEN THE CIRCULATION ENGINE WORKS NORMALLY, AS I CAN KNOW THAT THE LWCO REMOTE SENSOR IS WORKING OR HOW I CAN TRY THE LWCO CONTROL

    1. Matthew Simmons Avatar

      Is this a water boiler, like for hot water in your house or is this a pool/spa heater? I do not recognize that model number.

  51. John Avatar

    Matt, I have a Raypak R206A pool heater that is giving me a message that reads 6 minute ignition delay, what should I look at first ?

    The heater does fire up but stops after a couple of minutes….

    1. Matthew Simmons Avatar

      What is the actual code that reads on your display? Generally, Raypak’s codes are 3 letters long.

      Also, when the heater does finally ignite is there a loud bang or “whoosh” sound? Before the heater stops, is there a knocking sound or hissing?

  52. Steve Avatar

    We have a model Raypak 406-A unit with a new curcuit board recently installed about 3 months ago. We needed to break the the Low Nox circuit tab as it is not a Low Box unit. We actually forgot to break it when we first out it in and then realized we forgot to break the tab and got the TA6 Tab error code.

    It had worked flawlessly since we installed it.

    The old board (circa 2006) had a CLK error that we couldn’t clear likely to a degradation of the circuit. It also had the NOX tab broken.

    Anyway, yesterday we went to fire the heater (after using it several times in the past week) and now have the TA6 (Tab) alarm.

    Any idea what to try?

  53. Steve Avatar

    Edit: a new circuit board…and put it in. Can’t edit same post.

  54. Steve Avatar

    One more; LOW NOx not LOW BOX…

  55. Steve Avatar

    Actually we have the 407A which is Low NOx, does this mean the board is toast?

  56. Steve Avatar

    OK, so we have figured out a workaround, let me know if this is safe. I unplugged the P-10 air switch terminal wire on the board that is right beside the Low NOx tab (broken off), started the unit and it fired. It then ran for about 30 seconds and shutoff with a FAN error code. I started it again and this time after it started, I plugged in the P-10 air switch wire and it continues to run. Do you see any safety issues with this?

  57. Steve Avatar

    So it turns out that now when I start it with everything back normal, the heater fires without issue. It looks to me like it is a glitch in the firmware code of the circuit that can’t be cleared until the heater fires properly again. I had cleared all faults and set to default earlier but not until I unplugged the P-10 wire and then plugged it back in after it started did the error code for TA6 no longer appear. I wouldn’t just throw away the board if you get that error with a Low NOx unit, try the steps that I did and see if it can work for you as well.

  58. Steve Avatar

    One more thing, if you cycle the power to the board, the TA6 error returns and I have to unplug the P10 wire, fire the heater, then after it starts plug the P10 wire in again. It will start after you shut off the heater until the next power cycle.

    1. Matthew Simmons Avatar

      Thanks for the updates and resolution posts, solid work.

      By the way, sorry for the slow response, I was on Christmas vacation while you were troubleshooting the problem

  59. Steve Avatar

    Thanks for the reply, totally understand the late response during Holidays, Happy New Year! Our Holidays were much happier with a hot spa😀

  60. Steve Avatar

    Last one…so we have cycled the power at least 3 times recently and the heater has fired without issue. No more TA6 errors. I have put the screws in the panel to keep the board in place and we are enjoying hot water on demand remotely.

  61. Michael L. Avatar

    I am having an issue with my pool heater.
    Raypak model number C-R206A-EN-C ASME.
    It sparks, fires up and runs for about 10 seconds, then it says “no demand” and “SW Open”. It is about 10 degrees outside, so I am wondering if it is just too cold? The heater is in a room with the other pool equipment, but it is very cold in there. Please help

    1. Matthew Simmons Avatar

      Those readings are likely a bad pressure switch or temp sensor. But those codes could also be a byproduct of the temperature. Pool heaters are not meant to run in temp that cold.

      Because it is a commercial install (ASME) heater you should probably call Raypak directly to get a confirmation.

  62. Irving M. Avatar

    Hi Matthew.

    I have a “Rollout Sw Open” message. Do I need a new switch? Or is it something else?

    1. Matthew Simmons Avatar

      This is what the manual says about the Roll Out SW Open:

      Roll Out Sw Open – Rollout Switch – verify gas pressure, combustion air, blocked heat exchanger, proper vent size/connections, high wind conditions.

      Have you or a technician checked these causes?

  63. Kurt S. Avatar

    Mathew,
    The sun baked out my display on a Raypak 010253F circuit board ( I have Raypak heater 406a-EP-X-010213), I put on a new LED display fired up the heater and I can only toggle between “Remote No Demand” and “Off Water Temp”. I pushed the reset button to bring it back to factory settings, and when pressing the up/down arrows, it doesn’t go to “Defaults Set”. It appears my navigation is severly limited when pressing to the up/down and mode button. I’m thinking may the board is bad since it doesn’t allow me to move around the settings. Your thoughts?

  64. Kurt S. Avatar

    The sun baked out my display on a Raypak 010253F circuit board ****LED*** (See previous post) So I put on a new LED Raypak 013640F……

    1. Matthew Simmons Avatar

      I received the below reply from my contact over at Raypak:

      With respect to the problem on the 010253F PC board, it sounds like the customer had accidentally put the heater into remote mode- prior to replacing the LCD display. In order for the touchpad to operate, they must take the heater back out of remote mode- by holding down the UP and DOWN buttons for 3 seconds. This will take the heater out of remote mode, thereby enabling the touch pad.

  65. Joe W Avatar

    I have a Raypak Heat Pump Pool Heater, Model # R6350TI-E giving a flashing PSd code when powered up. Cant find this code anywhere in the manual.

    1. Matthew Simmons Avatar

      PSd, on the heat pump, would indicate either a bad temperature sensor or a loose wire.

  66.  Avatar

    Try to heat the Spa, supply and suck water to and from Spa only. The water level goes down and temperature not increase. Any suggestion? Raypak model R8350ti-e flash with FL3

    1. Matthew Simmons Avatar

      Going by the description of the problem, it does not seem like a problem with your heat pump, but something is up with your pump/plumbing. Below is the list of things the manual says it could be:

      Possible causes:
      • The filter is in backwash position.
      • The filter pump is stopped.
      • The filter is dirty.
      • Shortage of water to pool pump.
      • FIL parameter must be set to activate pool pump.
      • Water pressure switch must be adjusted or it is broken.
      • The unit is in the protection mode and will show (FL3), press any key to restart the unit.
      FL3 code will stop the unit and pool pump.

  67.  Avatar

    Hi I have a RAYPAK 406a I got a code of rol Is there any way to reset this or bypass Or what do I need to fix this problem

    1. Matthew Simmons Avatar

      The ROL code is listed in the article.

  68. Valerie Avatar

    I have a ream pool heater that works for about an hour then goes to spark and call for heat continuously until it Burns out the roll out

    1. Matthew Simmons Avatar

      Does it flash a code? If the heater is old, have you cleaned the heater of soot or debris? Is the heater well ventilated?

  69. Ken Sjoberg Avatar

    I have a Raypac RP2100 heater. I was getting a error code of INT (the display is hard to read), the service light then flashes and heater will not start. I had a guy come out and said the high tension wire was loose. It then worked. About a week later it did the same thing and did not start. I had the guy come out again and it started right up for him. The display shows the CFH and SPK codes, temperature, as it should. What is wrong, any ideas for this random problem?

    1. Matthew Simmons Avatar

      Call For Heat (CFH) and Spark (SPK) are normal codes when the heater is initiating its start-up procedure.

      TThe closest code I can think of that resembles INT, is VNT which is Vent Switch Open. Raypak state to turn off the heater at the breaker, turn off the gas and power; then call a technician.

  70. Mrugesh P. Avatar

    Our heater stopped working last night. When we turn it on, the RV1 code comes on, then switches to the Temperature of the Pool on the left, and Set Point of the Pool on the right. The code then switches from the temperature of the pool to the CFH code with “Clean Filters/Strainer” above it. We did a backwash and cleaned all the strainers in the pool. The code then switches from CFH to PRS with the “Service” blinking above the set point temperature. We check there is water going into the water heater and nothing has changed for the past 2 years. Pilot flame is not lit and no clicking is heard when we start it up. What do you think the problem could be?

    1. Matthew Simmons Avatar

      If you check your filter’s pressure gauge, is it reading the normal PSI as before when the heater was working? The issue seems like that water pressure switch is not receiving enough pressure to give the ok for your heater to ignite. That can be either a real flow issue, or you need to replace the pressure switch.

      To troubleshoot it further, I suggest you call Raypak. They are really helpful when it comes to troubleshooting these types of problems.

  71. Nadia Avatar

    Hi what does remote no demand mean?

    1. Matthew Simmons Avatar

      This is a reply I received from a Raypak tech regarding your Remote no Demand code:

      It means that the heater is in “Remote Mode” and the water temperature is at or above the setpoint temperature selected on the controller. First of all, is the heater connected to a remote controller?

      If not, then the customer may have accidentally put the heater into remote mode -by depressing the up and down arrows for three seconds or more. If this seems to be the case, they do the same thing to exit remote mode. If this continues to occur, then the buttons on the touchpad may be stuck, in which case they would need to change the touchpad (decal membrane switch). Hope this helps. Please feel free to give me a call to discuss further.

  72. Chris Avatar

    What heater sensor do I need for a Raypak model # P-D206A-EN-C with a SNS code?

    1. Matthew Simmons Avatar

      I believe it is the Temperature Sensor, IID Units – 009577F. The parts diagram for the ehater can be found here: Raypak Atmospheric Digital Heaters 206A-406A (11/01/04-Current) As shown in the article, the things to check:

      1. Water temperature is below 36F or above 110F
      2. If the two thermistors are more than 2 degrees apart, the SNS code will appear.
      3. Loose or corroded connection at P1.
      4. If the sensor is not mounted all the way into the JACO fitting on the header, it may give a false reading.

  73. Izabela Avatar

    Hello, I have a HL1 code, it keeps blinling service, what do I do?

  74. MD Avatar

    Hi,
    I have a Raypak R406A that I have inherited when I bought this house. Since I moved in, it has displayed HL2 after running for a little while (hour or two). If I bump it up only a couple of degrees at a time, it will take longer to display HL2 but it will inevitably get there every time I use the heater. The hottest I have seen the temperature get befire displaying HL2 is about 92 degrees but I have triggered the HL2 in the 80s as well.

    I already replaced the internal bypass kit which was toast, the temperature sensor which was still working but the thermowell was in bad shape, and the 2nd limit switch.

    Ran an inspection camera down the tubes and they do not appear to be bad condition or have much buildup at all.

    I took apart all of the jandy valves and they are all clear from obstructions.

    I am out of ideas here. Please help.

    1. Matthew Simmons Avatar

      Hello MD – I sent your question to a Raypak tech that works with Inyo, and he provided the following answer:

      HL1 or HL2 is an indication that the heater shut off via one of the auto-reset 135-degree high limit switches in the safety circuit. These redundant switches monitor the temperature of the water in the inlet/outlet header.

      When the water exceeds 135 degrees, one of the high limits will shut the heater down and either HL1 or HL2 will appear on the display. Assuming that the pump is running, the water inside the header will cool down and the high limits will reset- allowing the heater to fire up again- until the point where the water in the header exceeds 135 degrees and the process will repeat. This is typically referred to as “cycling on the limits”.

      This is most often caused by insufficient water flow velocity through the tubes of the heat exchanger. Causes can include: restriction in the tubes (scale buildup), corroded bypass, eroded bypass spring, corroded Unitherm Governor, restriction in water flow to the heater, or back pressure after the heater.

      If the HL2, in this case, is resetting and allowing the heater to fire after cooldown, then the switch is fine. If it does not reset after cooldown, then replace the high limit switch.

      1.  Avatar

        Thank you for your quick reply Matthew. I already replaced the 2nd high limit switch (assuming this is the switch that is closest to the right). I also replaced the U.G. and the internal bypass spring which was corroded. There did not appear to be any build up in the heat exchanger tubes.

        The heater does cool down and produce hot water again but then the HL2 code returns after a while again. Is this safe to keep running this way?

  75. Mike Avatar

    Hi… At my job, we have a model P2005-A and the error code is DELTA T. What does this mean? I’ve looked through all the recent messages and haven’t found anything similar. Can you help please?

    1. Matthew Simmons Avatar

      That model looks to be a commercial boiler and not a pool heater we are referring to in the article. Your best bet would be to contact Raypak directly.

      A simple search in google brought up an owner’s manual with all the codes for me. A little search goes a long way.

      “Delta T – Captures the highest Delta T Temperature recorded. Press UP & DOWN buttons for 3 sec to clear this entry”

  76. John Avatar

    Rheem natural gas pool heater model P-M267AEN-C throwing code PR5 and message “CLEAN FILTER STRAINER” with “Service” in smaller letters on top right hand side of display. According to your code reference it may be a clogged pool filter needing backwash. Are there any filters inside the heater I also need to pay attention to?

    Thank you.

    1. Matthew Simmons Avatar

      The heater does not have filters that need cleaning. The PRS code is referring to low water pressure. If your pump strainer is clogged or your filter media is dirty, the water flow could lower below the heater’s minimum water requirement. If you have a variable speed pump, sometimes this will flash if your pump drops to lower RPMs.

  77. Tim Avatar

    Hi
    I”ve got a RP2100, it’s worked fine for about 10 years, in the last week it will only heat up to about 85 deg. I’ve got the temp set for 102. It turns on fine SPK comes on and ignites runs with no error codes after about 15 minutes it will show SPK on display and reignite and run for about 10 more minutes then it repeats that and only gets to about 80some degrees. where should I look for the problem, no error codes.

    1. Matthew Simmons Avatar

      One of our close Raypak techs said to check for any loose wires/crimps in the wire harness. Also, check the wired going into the connector that plugs into the PC Board. Sounds as if it could be momentarily losing contact.

  78. Tim Avatar

    I fogot to add – I”ve backwashed it, pressure is good. Haven’t changed anything to the hardware.

  79. jordan Avatar

    i have a raypak tankless and when i run water it flashes 11 and beeps when my temp should be 120 any ideas whats wrong here?

    1. Matthew Simmons Avatar

      Is this Raypak unit you are working on a pool heater or a tankless water heater? I can help you with the pool heater, but I would need to know the model number of the pool heater.

      If you are referencing a house water heater, you would have to contact Raypak or a boiler technician company.

  80. Mick Davis Avatar

    Hi Matthew
    i have just purchased a new raypak M206A Pool heater and i shipped it to Thailand.
    Can you tell me what the input gas normal operating pressure should be.
    Thanks

    1. Matthew Simmons Avatar

      Did the manual ship with the unit? Is it Propane or Natural Gas?

  81. Andres Avatar

    Hello Matthew!
    We have a Raypak M336A, and the tech came out on Monday to turn the pool on for the season. He checked the heater and it fired up right right away. But now it won’t ignite, it just sparks. It’s throwing the HL1 and GVO codes. Any help would be appreciated, Thanks!

    1. Matthew Simmons Avatar

      Andres, those codes and what are causing them are listed in the article. Have a tech come out to correct the issue if you do not think you can check the systems that are mentioned in the recommended actions.

  82. jerry Avatar

    I work at a rental property and they have a pool&spa area. I have two ray pac units that are giving me problems they both go into pro5 codes and say clean both pumps straners and i take them out and clean them which they both have nothing in restart them both they light and run for 2 minutes they both shut down and relight again but they both go into pro5 codes saying clean straners again but nothing in them . What can i do.

    1. Matthew Simmons Avatar

      What is the model number of the heater? The residential models only flash 3-letter codes. Do you mean it was a PRS (pressure switch open)? If so, thoroughly backwash or clean the filter; if that doesn’t work then you’ll likely have to replace pressure switch.

  83. Dave Avatar

    I have Raypac C-R406A-EN-C. When it turns on it calls for heat, says spark, the pilot lights, then opens gas for the burner and burns for 3 seconds says heating, the burner turns off then calls for spark again. This continues cycling off and on, yet is does not stay burning. I have checked all sensors and none are bad. Help please.

    1. Matthew Simmons Avatar

      Sounds fuel related. If a spring start, could be air in the line. If so, should bleed out. Is there a vent tied into the heater?

      1. Dave Avatar

        We are connected to natural gas, flame looks good when it does burn. It is indoor and has a vent.

        1. Matthew Simmons Avatar

          Is there a power vent or extractor interlocked with the heater?

  84. Eric Avatar

    Hello, I have a raypak p-r336a-ep-c. The unit was already installed when I bought the home and come to find out it does not work. I going the transformer was bad and not supplying voltage to the PCB. Installed a new transformer in the unit and now I have power to the PCB and the LCD backlight turns on but there is nothing displayed. Do you think i need a new PCB or just the display? Is there any way to tell if the PCB is working? Also the unit had some burned up wiring down to the ignitor that I fixed as well is this something that happens with these units. Thanks a bunch.

    1. Matthew Simmons Avatar

      Most likely took out the sacrificial 5 amp fuse on the PCB- located next to the P6 terminal. This fuse protects the board from being shorted out. Its easily found at hardware or auto parts stores, or can be ordered under part #013733F.

      The igniter’s high tension wire is not one that is typically able to be repaired. It could have either been melted or chewed by rodents. The high tension lead is part of the igniter #002003F and should be replaced. I would also inspect all other wiring in the unit prior to replacing the 5 amp fuse and powering up the heater.

      1. Eric Avatar

        Thank you for the reply. The fuse is not blown and there is no other damage with the wiring that hasn’t been fixed. The LCD backlight lights up but there is no actual display. Is there any way to determine if the LCD is just not working and the PCB is? Thanks again.

        1. Matthew Simmons Avatar

          Okay, good. Could be just the display, but the heater should work. Problem is that, without the display, we don’t know what mode we are in and where the set points are. Try and press the mode button once and press the red up button a few times. If you hear a click and a spark, then the display is bad and the PCB is good. The display is replaceable, by removing the PCB and squeezing the two tabs on the back that hold the display to the board. If indeed this is the case, I can have one sent to you.

  85. Steve Urbanke Avatar

    Hi Matthew, just installed a Raypak 156a pool heater. Getting a sensor failure code. The unit is brand new but sat in garage for a year waiting for gas line install. Was unboxed and hooked up but won’t fire. Looking for initial install startup guide or checklist. Can’t imagine what’s wrong or where to start troubleshooting.

    1. Matthew Simmons Avatar

      Chances are good that a mouse got up into the heater and chewed the sensor wires.

  86. Steve Urbanke Avatar

    Ok I’ll start there. Are there any detailed instructions or diagrams as to accessing the sensor and wire? I have taken off the front cover but do not know where to go from there. What is the easiest way to access the sensor and wires you think are damaged? Remove the upper panel where the digital display is? Or a side panel? Or is it in the rear? I’m fairly handy but don’t want to pull things apart that don’t need to be. Thanks!

    1. Steve Urbanke Avatar

      Ok Matthew it was a lose connection at the sensor in the rear. I now have SPARK appearing on the display but it isn’t lighting. I only let it try for about 30 seconds at best. I wasn’t sure how long on initial unit startup (zero use so far, new install) it should take to fire the heater.

      1. Steve Urbanke Avatar

        So I let it attempt to light for several minutes and now get the error code Ignition Failure, no pilot sensed. Gas appears to be on, could it be a low gas flow issue? Lines are new, could I possibly make an adjustment to the gas valve to allow more flow?

    2. Matthew Simmons Avatar

      The sensor is located on the inlet side of the inlet/outlet header (where water enters the heater), in a white compression fitting. You will need to remove the side access panel above the inlet/outlet, then follow the wires as they lead to the main control panel. To access the control panel, the front door needs to be removed as does the two screws on each side of the control panel. The panel will then hinge down exposing the PC board. The temp sensor wires plug into the board near the bottom RH side.

      1. Steve Urbanke Avatar

        Thanks for the info. See my messages above, as I have resolved the sensor issue but have a new issue. Could the gas be too low?

  87. Christopher B. Avatar

    Getting an “ILO” error. Are there any troubleshooting tips to address this or do I just need to call a tech?

    1. Matthew Simmons Avatar

      ILO is ignition lockout. If this is a propane heater, they have a 90-second lockout that is required by code. Basically, the pilot is not proving within 90 seconds. You should be able to turn the heater off and back on and it should begin the spark process again. Also, confirm that the tank has gas. If that doesn’t work, then a tech will need to look for the cause. Hope this helps.

  88. Gene O Avatar

    I have an older Raypak P-R206A-EN-C. After CFH, SPK sequence I get CLK, or sometimes heat for a minute then CLK. I do not have a clock/fireman switch.
    It is clearly an failure. What is strange is that if I put pressure on or below the LCD screen, the CLK can disappear and the unit will heat? I don’t know how long because obviously I can’t stand there with my finger on the screen.

    I am about to replace the control board but now I think the LCD may be creating the open?

    1. Matthew Simmons Avatar

      It could be the long pin connector on the back of the board. On that connector, you will see a red loop of wire labeled fireman switch or CLK. Try wiggling that wire as the unit is calling for heat. If the heater sparks and fires, then the connection inside the plastic connector has been lost. Probably some insulation crept down the wire and interfered with the connection. Try a new section of wire harness. If that doesn’t work, it could be the pin on the board or failure inside the PC board. But try the wire first.

  89. Steve Avatar

    Hi. Great site here. I have a raypack P-M266A-EP-x. I get a CFH, then an HL1(with the Service Flashing). We don’t use the heater often, but only in the hot tub once in a while. I looked up the HL1 code and it says something about the temp being too high for the high limit. The only thing is it won’t start up in the first place, so no heat is being generated.
    Thank you

    1. Matthew Simmons Avatar

      HL1 is a high limit trip. With the pump on, this switch should reset as the water in the header cool- the heater should fire again. If it doesn’t reset, then the hi-limit switch could be bad.

      If the heater is cycling on and off on the limit switch, then it is a low water flow condition. Inspect the bypass in the header and confirm the integrity of the bypass spring. The high limit trip is telling us the water in the header is exceeding 135 degrees. Water is not moving through the exchanger fast enough causing it to super heat.

      1. Steve Avatar

        So I think I understand. Since the code HL1 comes up within about 15 seconds after turning it on, it is probably a bad high limit switch? The pilot never clicks or turns on. It just says cfh for like 15 seconds, then the hl1 code. It just seems that since it isn’t even heating up, it can’t be hitting 135 f in the water. Thanks

  90. Steve Avatar

    So I think I understand. Since the code HL1 comes up within about 15 seconds after turning it on, it is probably a bad high limit switch? The pilot never clicks or turns on. It just says cfh for like 15 seconds, then the hl1 code. It just seems that since it isn’t even heating up, it can’t be hitting 135 f in the water. Thanks

  91. Steve Avatar

    O have a raypak 266a. I am looking at mine and it looks like there are 2 high limit sensors, but the manual shows 1? Thanks

    1. Matthew Simmons Avatar

      After reviewing a couple of Raypak diagrams, the 266A residential atmospheric heaters uses two of the Hi-Limit 135 Degree Surface Mount (006725f). The 14A picture diagram, shows the placement of the two Hi-Limit sensors as Key 6 on the headers.

  92. Will Avatar

    I have a Raypack R406A heater that I inherited when I bought my home. It has worked flawlessly until recently. Beginning some time ago, it will turn on, heat the spa to around 98F then shut down. It will not re-ignite and stay on “SPK” until the power is cycled.

    Is this the high limit switch? It doesn’t show any error codes, but from my research, it could be this. If so, can you tell me what part number I need and provide guidance on how to replace it?

    Thanks in advance!

    1. Matthew Simmons Avatar

      If you are getting SPK, and can hear the spark, then the problem is not with the high limit or any of the other safety controls. When you are seeing SPK, check to see if the pilot is lighting. If the pilot is lit, it should begin a sequence that would signal the PC board to open the main gas valve and fire the burners. Said signal is a DC signal and could be interrupted by a loose or disconnected ground wire, chewed or bare wire leading from the gas valve up to the PC board, or a loose connection at the PC board. Also, inspect the condition of the pilot itself. Excessive corrosion on the pilot could also interfere with the proving signal. If the pilot is not lit by the spark, then turn off the gas and clean the pilot and pilot tube.

      1. Will Avatar

        Thanks for the reply. I’ll take a look at the pilot and the wiring. I did a little more testing. I can get it to light in pool mode, but it refuses to in spa mode. Installed new filters and the flow pressure is fine.

      2. Will Avatar

        Ended up buying the current model from Inyo Pools and replaced it myself. Old unit was completely corroded. Figure it lasted 12 years, so another 12 would be amazing.

        1. Matthew Simmons Avatar

          Sorry, you couldn’t salvage the old unit; but thanks for getting the new one from us.

          Raypaks are pretty darn solid, you should get a good life out of it.

  93. Jon Avatar

    Recently had my transformer replaced on my Raypak 407a heater. It then fired up and started heating. Since then, I’ve had a few issues:

    1) It would shut off at random increments and the last error codes have been FAN and ROL. Not sure why it wouldn’t stay running…but it’s not a newer model that has the auto-shut off after 3 failed attempts)
    2) Now, when I turn power on, it goes through its cycle but stays on SPK. I can hear it trying to spark but it never fires up. Error code now shows ROL for last several codes. When I try to press the red reset button on the rollout switch (or what I think is the rollout switch) I hear a big click and it tries to spark again. If I hold down the red reset button, the screen says ROL and SERVICE in the upper right corner.

    Any ideas??

    1. Matthew Simmons Avatar

      In the article, the FAN code is listed, states why it is happening, and how to fix it, same with the ROL. Have you tried any of the things mentioned in the “Possible Solutions” column?

  94. Jack Avatar

    Hi! First time doing this..so here we go. I have an old Raypak 2100 pool heater – Model CR – 185 – EN. Used it extensively last summer, just tried to fire it up this year with no luck. Replaced the transformer last year, so it’s new.

    I’m getting a clicking sound when I try to fire it up, so I think the electronic ignition seems to be working. No flame. The only note is that it is looking for heat (no fancy codes). I don’t smell any gas no matter how long I let it go. Your thoughts are appreciated.

    1. Matthew Simmons Avatar

      If the heater is sparking, but the pilot doesn’t light, first make sure that the knob on the gas valve is turned to on, make sure the external gas shut off is set to on, and manually bleed the air from the gas line by cracking the union until you smell gas. Second, when the heater is sparking, check for 24VAC at the pilot valve terminal on the gas valve (red/black wire). If power exists at the pilot valve, loosen the pilot tube from the gas valve and see if gas comes out. If no gas, then the valve itself could be bad. If no power at the pilot valve, check for 24VAC coming from the ignition control (other end of the red and black wire). If the ignition control is sending spark, but no voltage, then it could be a faulty ignition control box.

      If the pilot does light, but no main burner. First, check for 24VAC at the main valve terminal (violet/black). If the power at the main valve, but no main burner, then lightly tap the side of the gas valve. It could be stuck closed. Even if it pops open after tapping, it should be replaced. If it does not pop open, replace gas valve. If no power at main valve terminal, check for power out of the ignition control (other end of the violet/black wire). If power is coming out of ignition control, check violet and black section of wire for cuts, missing insulation, loose spade connections, etc. If no power out of ignition control, then check the green ground wire connection at the gas valve. If all ground connections are stable, then it could be a bad ignition control; but, also check the condition of the pilot itself. If it appears dirty or corroded- then remove and clean the pilot. Or, if very rusty, replace the pilot. Also, WITH THE POWER TURNED OFF, check condition of ribbon burners, by taking a piece of solid wire and running it in and out the length of all of the burners. There could be spider sacs or cobwebs interfering with the flow of gas.

  95. Tsharp Avatar

    i have a Raypak P-R207A-EN-C that is giving a “PV output fault”. My manual and this list doesnt cover that. Is that fault a voltage issue? Are there any fuses anywhere (i dont see any)? Any help or info is greatly appreciated!

    1. Matthew Simmons Avatar

      PV Output Fault typically means that either the pilot valve relay or the main valve relay on the PC board failed to open or close. Replace PC Board.

  96. Wpolo coach Avatar

    Hi – I have a 4 yr old Raypak 84 Prol model 409. The heater display says “Vent temp limit”. I reset the vent temp limit switch, checked for exhaust vent blockages (none), and increased the water flow (variable speed pump). Heater worked, then stopped within 2 hrs, displaying same message. Reset the switch again, and heater seems to work for now. What’s going on? Bad sensor? Bad switch? Bad karma?

    1. Matthew Simmons Avatar

      It’s likely that the heat exchanger is sooted and needs to be pulled out and cleaned.

  97. Mark c Avatar

    When I switch on my heater is shows RV 1 then the temp .When i press the control buttons nothing happens at all???

    1. Matthew Simmons Avatar

      What is the model number of your heater?

  98. Glenn Avatar

    Turned on my heater and was working normally. At sometime during the long day of enjoying, I went to turn off the heater and noticed a CFH code. Then after I turned the power off and turned back on, after the CFH code a CLK code comes up. Help!?

    1. Matthew Simmons Avatar

      The CLK code means that the heater is off on the fireman’s switch. Is there a fireman’s switch interlocking your time clock with the heater? A fireman’s switch shuts the heater down twenty minutes before the pump shuts off. If you don’t have a fireman’s switch, check the red loop of wire, on the safety circuit connector on the PC board, for any damage or loosened connection.

  99. Jr Espada Avatar

    I have an electrical Raypak pool heater. I keep getting a “dsd” or “d5d” code. What could that be?

    1. Matthew Simmons Avatar

      What model heater do you have? I’m not familiar with that code.

    2. Matthew Simmons Avatar

      According to the manual for a Raypak heat pump, the issue is, dSd – The suction line temperature sensor is open or may be defective. You didn’t specify the actual model of your unit, so I am going with the first one I found,

  100. EM Lentz Avatar

    Question: Raypak Digital 406A that was on propane. But, my home underwent a natural gas conversion and I had them run a dedicated gas line which is now plumbed into the heater. I obtained Raypak’s propane-to-natural gas conversion kit per the manual which essentially swaps out the gas value regulator, burner orifices, and pilot orifice. However, since my Raypak was originally sold (to my home’s prior owner) as a propane heater, the control board has the broken tab for propane heaters. Will I need to get a new control board because that tab was broken, or if the conversion kit is installed and everything is ready for start-up and adjustments made, will I have a problem? Will the unit fault or not fire due to the control board with the broken off tab?

    1. EM Lentz Avatar

      And a quick follow up to my prior note: If I did obtain a Raypak conversion kit for propane to natural gas, and do need a new control board that is intact without a broken tab, why on earth would Raypak’s “conversion kit” not discuss or mention the need for a new control board?

    2. Matthew Simmons Avatar

      Raypak does not offer a conversion kit for Digital Electronic Ignition models 200,000btu or larger. The conversion kit is only applicable to millivolt (standing pilot) models. That being said, it’s likely that you will need a new gas valve, but you don’t necessarily have to change the PC Board. The 90-second ignition lockout, required by NFG for Propane appliances, shouldn’t have much of an impact on the operation of the heater. It may be a slight nuisance upon spring startup. It usually is not worth replacing the PC Board.

  101. Bill Avatar

    I have a 406 propane Raypak pool heater which cycles off high limit 2
    I have switched High limit 1 and 2 Sensors with no success
    Replaced Unitherm Governor with no success
    Where do I go from here?

    1. Matthew Simmons Avatar

      Confirm adequate water flow to the heater. Does the disc, on the internal bypass, glide freely on the shaft? If not, replace bypass 006715F. Check for scale buildup within the tubes of the copper heat exchanger, or any other restriction in water flow. Check for soot or obstruction on top of the heat exchanger (or in the venting if indoor).

    2.  Avatar

      Try insulation on the heat shield above the HL sensors. That worked for me

  102. Ron Eisnaugle Avatar

    Getting CFH then SPK but no flame picture is showing. Any thoughts ?

    1. Matthew Simmons Avatar

      Is the pilot lighting? If so, then the proving signal is not getting back to the PC Board. Confirm that all gas valve wiring is intact, and connections are solid. Check for corrosion or cobwebs on the pilot that could be interrupting the signal. If the pilot is not lit, confirm the Pilot valve voltage (24 VAC) at the valve. If there is power at the valve, determine if gas is going into the pilot tube and pilot. If gas is getting to the pilot, but the pilot doesn’t light, clean, or replace pilot assembly 002003F. If no gas coming from the energized pilot valve, replace the valve. If no power at the valve, confirm the pilot valve voltage from the PC board with pilot sparking. If no power, replace the board. The problem lies where the power dies. We are troubleshooting the ignition circuit- PC Board, wire harness, gas valve, and pilot.

  103. Bob D Avatar

    Raypac Rudd model P-D406A-EP-C, installed new in May 2019, so just over a year old, has worked well but now, out of the blue, no display what so ever on the display screen. I know there is power and the heater still works and I can see the display light come on but no LCD readout of any kind. Not located in the sun. Thanks for any help.

    1. Matthew Simmons Avatar

      Moisture could have possibly breached the control box and compromised the display. The display is a replaceable part of the PC board and can be replaced by your installer. Part #013640F. If your installer/service tech needs one, I can have one sent to you.

  104. Sach Avatar

    Have RayPak P-R405B- EP model .

    1) I am having fireman switch error code on raypak screen.

    2) I have Err1 on the remote . Changed the water sensor but the code is this there.

    How can I resolve fireman switch and Err1 code ? Any thoughts ?

    1. Matthew Simmons Avatar

      Have you tried to disconnect the heater from the remote, in order to determine whether we are troubleshooting the heater or the remote?

      How is the remote wired into the PC Board of the heater? Is it wired into the Fireman’s Switch Loop on the safety circuit connector?

  105. Greg Avatar

    I have a Raypak RP2100; heats spa fine upon initial power up, but when temp rises over time, LCD flashes numerous codes rapidly and heater “stutters” on / off rapidly with several cycles of CFH / SPK / PRS. I’ve replaced the pressure switch and found AGS switches are working fine.

    Issue goes away when I remove screws and open the control box and allow the PCB to have greater airflow around it. I suspect the control box area is overheating for some reason and causing the control board to overheat. Any known conditions that cause this? Time for a new control board?

  106. Terie Avatar

    Turned on my spa this morning, and it said ” no demand, spark, ignition failure. Anyone familiar with my need for repair?

    1. Matthew Simmons Avatar

      It is mentioned a few times in the comments above. What is the model number of your heater? Also, what is the water and air temp?

    2.  Avatar

      Light your pilot

  107. Jason Avatar

    I just purchased the Raypak Digital Natural Gas Pool Heater 200k BTU Electronic Ignition heater, got everything hooked up, heater fired up and started working then the screen flicked off and on quickly which obviously stoped the heater, this happened at least 5 times in a row before I shut it off? Any thoughts on what the issue is? Thanks in advance.

  108. Herman Lawless Avatar

    My Raypak pool heater started fine first few times this year. Now it will not light and gives me a CLK signal. What is my problem and how do I fix it?

  109. Beverlie@aol.com Avatar

    I get lflame. No call for heat

  110. Scottpez Avatar

    Help I have a new Raypak 400k heater. It worked great for a month and now shows flow/field #2 code. I changed the filter but the issue is still coming up. Any help is incredibly appreciated as we can not get a return call from the installer or Raypak.

    1.  Avatar

      I’m also having this issue

      1. Matthew Simmons Avatar

        Have you checked for blockages in the plumbing line? Also, do either of you use variable speed pumps? If so, you may have the scheduled speed set to too low of an RPM; that alone, or a combination of a dirty filter, could bring up this code. Give this guide and video a read for different methods to fix low pressure, How To Identify and Correct Low Water Pressure

  111. Michael Hutchison Avatar

    I have a new Rheem-Raypak gas pool-spa heater. This unit was installed in April of this year. The rollout switch open message is on the control. How do you reset the rollout switch?

    1. Matthew Simmons Avatar

      From the article under ROL:

      1. Possible downdraft of burner flame. If sensor has red reset button, press button & determine cause.
      2. Does your unit need a high wind stack?
      3. Check wiring for burns- especially the ground wire and wires at gas valve.
      4. Replace wires if necessary.

  112. Bob Avatar

    Help I have a Raypak 266A that worked fine and after no use for several months reads SENSOR FAILURE.
    All connections look good . Does the sensor just fail like that or is it a board failure?

    1. Matthew Simmons Avatar

      Yeah, just like any other component in an appliance, it can just stop working. Sometimes there are warning signs, some times there aren’t. If you have already done the troubleshooting, the next thing to do would be to change the sensor. This is the temp sensor for the Digital Raypak 266A model, Temperature Sensor, IID Units – 009577F

  113. David R Avatar

    Hi, I have a Raypak E3T, Model ELS 005-1-Ti. Stopped working around 1.5 years and pool tech found element and triac to be bad. Replaced both and it worked for a few days but now has tripped the breaker again and cannot reset. Pool tech said element tests ok but triac is bad again. Anyone have any experience with this?

    1. Matthew Simmons Avatar

      If you remove the power of either heating element does it still trip?

      Is it tripping a regular circuit breaker or a GFCI?

  114. Lisalisa Avatar

    Code FA displaying when pump not on? Usually just E3 which indicates no water flow. Obviously because pump is not on. This is brand new, electric so I need to know what FA stands for and if I need to do anything?

    1. Matthew Simmons Avatar

      I’d check your brand new manual; page 24 says the “FA” fault code means ‘PFC module over current protection.” On that same page 24, the manual shows “E3″ means ‘low water pressure protection.” The heater shuts off when there is no water flow to protect itself from overheating; that’s why you are seeing this when the pump isn’t running.

      Do the codes clear when the pump is running? If so, there isn’t a problem. If the FA doesn’t clear, you need to recheck your wiring.

    2. Dennis Avatar

      Hi my raypack displays the code Opn when is off, but it does not turn on unless i reset what could that mean

      1. Matthew Simmons Avatar

        What is the model number of your Raypak heater?

        1.  Avatar

          Is an H3-0402B

          1. Matthew Simmons Avatar

            That appears to be a boiler/water heater. Our company and our guides only deal with Raypak’s pool and spa heaters.

          2.  Avatar

            Is a pool i use it for

          3. Matthew Simmons Avatar

            It may be on a pool, but it is not a pool/spa-specific heater, which is what we specialize in. Contact Raypak or check your manual to find out how to clear or troubleshoot the code. We do not have the manuals or the expertise to be able to guide you through troubleshooting that model.

    3. Michael Shanholtz Avatar

      Need help with a new 8450t1-e heat pump. Pool heater. Not heating pool and the control panel has half letters. Hard to read. But kind of looks like control fault.

      1. Matthew Simmons Avatar

        How new is it? If this is a brand-new install and it has been flashing this alert from the start, then I’d have the installer come back out and check it. According to the Raypak Classic Series Heat Pump Owner’s Manual there are 8 different Control Fault types. You must know the specific error code to know the remedies.

  115. Justin Avatar

    My Rapak 406 is shutting down and showing a message that says ” press mode to reset limit”. Aftre going through mode and it re-firing up it gives shits down again after a few mninutes and same message. any advise?

    1. Matthew Simmons Avatar

      Is this a new or old heater? Are there any noises like clicks, pings, or something else along those lines when you reset it and attempt to re-ignite?

      1. CB Avatar

        Not the same poster but the same problem. Mine is a brand new heater. There are no unusual sounds from the heater. What limit is it referring to? The water is only 80 degrees so could it be a flow limit?

        1. Matthew Simmons Avatar

          Is your pump running while the heater is trying to fire up? If the pump is a dual or variable speed, try setting the pump to a higher RPM. And lastly, try cleaning your filter.

          Does HL1 or HL2 get flashed as well?

          From the manual:

          High Limit events require a manual-reset: To reset unit press MODE.

          Helpful tips to prevent High Limit events:
          1. Confirm circulation pump is running during heating cycle.
          2. Pump should shutoff a minimum of 5 minutes after heating cycle ends. Failure to follow these steps may cause residual heat buildup – triggering a High Limit event.

          If issues persist, contact your service installer.

    2.  Avatar

      I have blinking next to my temperature on heat pool mode why is it blinking?

      1. Matthew Simmons Avatar

        What exactly is blinking?

        1. Tanya Avatar

          I’m having the same issue of the screen flashing something about remote start. I held the up and down arrows for 3 seconds but now when I push buttons nothing happens.

          1. Matthew Simmons Avatar

            Press the MODE button until it appears on the digital display. Press and hold both the UP and DOWN buttons for 5-7 seconds until DEFAULT SET appears. This operation resets the operating program to its factory default values.

  116. Kelly C Avatar

    I have a RAYPAK Model P-R206A -EP-C PROPANE Spa Heater. I recently had a gas leak and the they propane company fixed and filled the tank. When they tried to fire up the heater the error “No Pilot Detected” came up. They did not know why as they say gas if at the unit. I have checked all the blogs and can not find the error listed anywhere. Do you know what may be the issue?

    1. Matthew Simmons Avatar

      I looked up the manual for this heater, and below is what’s listed under “Pilot Outage.” Did the gas company install the same sized gas line as the previous? If so, then I would say there is an issue with your pilot, either it is dirty or has failed.

      Low gas pressure………………………….. Adjust gas pressure.
      Restricted pilot………………………………. Clean pilot.
      Weak pilot generator………………………. Replace pilot.

  117. Craig Avatar

    Hello,

    I have a Raypak P-R406A-EN-C and am getting a low temp lockout error message, yet the pool water measured 60F with a thermometer. So is the temp sensor dead again or is the board the issue?

  118. Tom Panagiotidis Avatar

    Hello,
    I installed a 400k BTU Raypak pool heater, LP last summer and i am getting the following error message after it runs for about 15-20 minutes “Press Mode to Reset Limit” what can be causing that.

    1. Matthew Simmons Avatar

      Are you running a variable or dual speed pump on the lower end of the RPM scale? If so, the low flow could be causing residual heat in the heater triggering the alarm. I’d up the RPMs to see if that clears the problem.

    2. William Paredes Avatar

      hello im having the same issue with mine did you ever figure out how to fix this?

  119. Ken Avatar

    I have a Raypak electric heat pump mod# 8450 TI-E; serial #WO 52145953.
    Shows an error code H2O sensor fail. I found water temp sensor – H000031.
    Not sure if this the correct part because my exact model # is not shown.
    Am reluctant to order if incorrect & not returnable. Please advise.Thanks

    1. Matthew Simmons Avatar

      According to the manual, the correct replacement sensor is H000329

  120. nat Ficarra Avatar

    i have just brought a raypak spa heater po 131 natural gas .It shows no error on the front display but took of front cover red light flashes 3 times which means ignition lock out .How can I fix this

    1. Matthew Simmons Avatar

      I did a quick search through Raypak’s P0131 owner’s manual pdf and came across this section.

      In the event of an over-temperature situation, the heater will shut down and lockout. The reset lamp will be illuminated and the reset button must be pressed to resume operation. (This is a safety requirement of AS4560). Should an over temperature situation arise regularly, you should check the following:

      1. Ensure skimmer box is not jammed and that the filter is not blocked.
      2. Ensure all valves are in the correct position and that there is adequate water flow through the heater.

      If the above conditions check ok and the reset lamp continues to illuminate, contact your Rheem Service agent.

    2. Stacey Avatar

      I have a R3350ti-e and it will work for awhile then give different error codes, like F51 or F52. I can’t find a manual anywhere for my t. It’s manufacture date is 2014

      1. Matthew Simmons Avatar

        I believe the FS1 and FS2 code is referring to “Control Faults”. The Classic Heat Pump’s owners manual says the following:

        FS1 is a compressor relay failure; the recommended action is “Auto reset in 1 hour or Recycle control – replace control if fault continues.”
        FS2 is ROM CRC Failure with the recommended action being “Auto reset in 1 hour or Recycle control – replace control if fault continues.”

  121. florianocabral@yahoo.com Avatar

    Hi, I have a Raypak R8350TI-E Heath Pump. It’s and older unit but always worked great. Now I am getting a Code HP , I have cleaned the coils and tested water flow , also replaced the hi pressure sensor , and I am still getting the same error. Any ideias ? Thanks.

    1. Matthew Simmons Avatar

      In the Raypak R8350TI-E Heat Pump owner’s manual there’s no “HP” code listed. The things I think it could be are listed below, based purely on the acronym HP.

      Hi Press Trip – High pressure switch is preventing compressor from operating. – Check High Pressure switch operation – replace as necessary.

      Hi Press Lockout – High pressure switch has tripped 7 times in a single thermostat demand cycle. – The compressor is locked out of operation for 4 hours with an
      auto reset. However, this lockout time can be reset by pressing the MENU button or cycling the power. Check refrigerant charge and adjust as necessary. Check for low water flow.

      1. Theresa Bhatia Avatar

        I have a 1 yo raypak 406

        I constantly get a Set Mode to reset limit error and I cannot use remote setup to control my hotub

        Also the hot tub never gets to its maximum temperature

        Btw- I recently had the gas line upgraded to heater requirements with a new regulator – problems have occurred since then

        1. Matthew Simmons Avatar

          Sounds like it could be tripping one of the high limits. Confirm proper water flow- clean filter and baskets.

  122. ROGGER A GARCIA Avatar

    REPLACE DIGITAL BOARD ON ELECTRIC POOL HEATER AND SHOW PSd

    1. Matthew Simmons Avatar

      What is the model number of your pool heater?

  123. Mike Avatar

    I have a raypak pool and spa heat pump it is not heating pool and shows f52 code

    1. Matthew Simmons Avatar

      What is the model number of the heater? F52 is not a valid code for their Raypak RP2100 series.

    2. David Avatar

      My 1 year old raypak 206 gives me a “press mode to reset limit” code after 5- 15 minutes of operation. Replaced the temperature sensor, today, same problem. Any ideas? I have a non variable speed pump, fwiw.

      1. Matthew Simmons Avatar

        Do you know what software version your control board is running? This is a fault with main PCBs running 1.07 software version. Raypak revised the control board software to a 1.08 version, which should fix this nagging issue. you’d need to replace the main PCB.

        Raypak PC Board Control Replacement Kit for Digital Gas Heater 2004-Current – 100-10000345

  124. Chris M. Dallas TX Avatar

    I have a Raypak Model P-M336A-EN-C , Serial # 1804319049 – which was made in 2014

    Currently the only thing displayed on the LCD screen is “SET FACTORY DEFAULTS”

    Pushing the temp buttons or trying to holding both of them at the same time does nothing to change this message. The screen is locked up. I’ve tried resetting the circuit breaker to remove power from the system but nothing gets rid of this message as the screen is locked-up.

    Maybe the mother board is bad on the unit? All the sensors are working as water temp is correct, etc. So could use some idea on how to reset the system ??

    Thanks for the help, Chris

    1. Matthew Simmons Avatar

      Refer to page, 34 on the old Raypak RP2100 user manual to see if it unfreezes the screen:

      Program Button
      1) Remove the four screws holding the control cover,
      and swing the panel down so the back side of the
      board is visible (see page 31). Locate the Program
      Mode button (marked as SW1) as shown on page
      33. Press and hold the button (5-7 seconds) until
      Set Factory Defaults appears on the display.
      Release the program button.
      2) Press the Mode button sequentially until the
      desired program event is reached. There are 5 different events that can be programmed.

  125. RICK Avatar

    I have a raypak 106 heater and I am receiving a blinking light on the ignition control board. it is blinking 7 times but I can’t find anything in the manual.

    1. Matthew Simmons Avatar

      How old is your heater? All the pictures I’ve found of the Raypak 106A’s ignition control, there are no lights on it. Are you actually referring to the heater’s LCD screen next to the control buttons?

      Are there any other flashing alerts?Raypak 106 & 156 – Owners Manual

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