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.

 

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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.

 

Fault Code DisplayDefinitionPossible Solutions
BD1Board failure1. If this code appears and stays on, turn off power to board at toggle switch and source, then re-establish power.
2. If code reappears, replace board as the main processor failed to start.
EEPIndicates that memory failed to start on main processor.1. Turn off power at toggle switch and source, then re-establish power.
2. If code reappears, replace board as memory has failed.
FANIndicates the Pilot was lost, or the air pressure switch is not closed when required. 1. Check for correct incoming power at fan relay- 120V or 240V and at fan motor.
2. If pilot is confirmed, check for 24V minimum out of fan relay to pressure switch.
3. If switch does not make when fan is operating, verify the tuning between fan housing and switch is connected and is not kinked.
4. Soft lock out after 3 attempts- automatically resets after 5 minutes.
FFLIndicates a false flame signal. 1. Check to see if pilot is staying lit after CFH is satisfied. If pilot stays lit, the pilot valve in the gas valve is hanging open. Replace gas valve.
2. If gas valve is working properly, problem lies with the pilot system or board. Turn power off at toggle switch.
3. Unplug ignition wire from board and pilot and remove green ground wire from burning tray. Clean and reconnect ground wire.
4. Turn power on. If no spark at ignition module, turn power off and replace the PC board.
4. If you saw a spark at Ignition Module, turn off the power and reconnect wires.
6. Turn power on and unit should fire.
GVCNo power detected at PV or MV when commanded.1. Turn power OFF and disconnect Ignition Wire and Gas Valve wires from board.
2. Power ON and watch for spark at module.
3. If no spark, turn power OFF, and replace board.
4. If spark is observed, turn off power and reconnect wires. The unit should fire.
5. If unit does not fire and code reappears, power OFF, disconnect valve wires from board and remove MV, PV, and ground wires. Clean and reconnect.
7. If unit does not fire, replace the gas valve.
GVOPower found at either PV or MV at the incorrect time.1. Turn power OFF and disconnect Ignition Wire and Gas Valve wires from board.
2. Power ON and watch for spark at module.
3. If no spark, turn power OFF, and replace board.
4. If spark is observed, turn off power and reconnect wires. The unit should fire.
5. If unit does not fire and code reappears, power OFF, disconnect valve wires from board and remove MV, PV, and ground wires. Clean and reconnect.
7. If unit does not fire, replace the gas valve.
8. Low power to transformer can cause a GVO fault.
HL1The high-limit has exceeded 135F1. Possible excessive water temperature in the tube bundle. Once heater cools, high limits resets automatically.
2. Check for blockage in tubes.
3. Check for low water flow.
4. Check Unitherm governor- replace if necessary
5. check bypass assembly- replace spring or bypass if necessary
HL2The high-limit has exceeded 135F1. Possible excessive water temperature in the tube bundle. Once heater cools, high limits resets automatically.
2. Check for blockage in tubes.
3. Check for low water flow.
4. Check Unitherm governor- replace if necessary
5. check bypass assembly- replace spring or bypass if necessary
IGNIgnition failure1. If the unit fails to hold a flame after 3 attempts, it will go into a hard lockout. Interrupt the power supply to clear the lockout and check for air in the gas line or not enough gas pressure.
2. IGN only appears after pilot has proved and main valve has been powered.
ILOIgnition lockout (Propane units only)1. The heater has performed too many attempts to ignite the main burner and will take a short break.
2. Inspect pilot assembly.
3. If pilot assembly is OK, then the culprit may be your PC board.
PRSLow water pressure1. Check water levels at skimmer face. (should be middle of skimmer face)
2. Ensure pump is running.
3. Check filter pressure. Backwash if necessary.
4. Check heater location- if more than 5 ft above or below water level- adjust pressure switch.
ROLThermal 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.
SNSTemperature sensor is out of acceptable range.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.

 

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259 thoughts on “Raypak Heater Fault Code Guide

  1. 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.

  2. 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?

  3. 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.

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

  5. 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?

  6. 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. 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?

  7. 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. 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.

    1. 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.

  8. 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. 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).

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