Question about Raypak Rp2100 Pool & Spa Heater Lonox 407k Btu Natural Gas Polymer Header Digital Rp407aenc

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My display reads "GVO" I know it means gas valve open. But, what can I do about it?

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  • fls1965 Sep 02, 2010

    no luck cleaning the pilot. I can hear the igniter zapping. Absolutely no gas odor. It's always had code RV1 when starting, but still worked. I haven't found any reference for that code.

  • fls1965 Sep 03, 2010

    No luck cleaning the pilot. I can hear the igniter zapping, but no gas odor at all. It also displays code RV1, I can't find any reference for that code. This code has always displayed when starting. The heater still worked though.

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  • 857 Answers

The Thermocouple is the most likely cause. But before replacing it clean out the pilot orifice. Sounds like it may be partially clogged. You should have a nice wide flame that is hitting the thermocouple dead on. The thermocouple is a safety device that shuts the gas off if the pilot goes out. If it is defective no gas will flow. This is a very common problem with gas heaters

Posted on Sep 02, 2010

  • Jayant Jha Sep 03, 2010

    This message indicates:

    SNS Sensor failure, Water temp. below 36°F
    or above 110°F - The water temperature sensor has failed or a wire is broken.



    For your refrence look into the user manuel

    http://www.raypak.com/uploads/6000.59R.p...

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Raypak 2100 265A displays GVO. I know it means Gas Valve Open, but I do not know what is wrong. It is a IID Electronic Pilot. I see a slight flame when the igniter lights and then the system goes into GVO...


Here is the directions from raypak on this code.

1. Turn off power and disconnect ignition wire and gas valve wires from cpu board.
2. Turn on the power and watch for spark at module.
3. If no spark is observed, turn off power and replace the board.
4. If spark is observed, turn off power and reconnect gas valve and ignition wire.
5. Turn on power and unit should fire.
if unit does not fire and code reappears, turn off power and disconnect gas valve wires from the board and remove MV,PV and ground wires from the gas valve. Clean and reconnect wires.
7.Plug the gas valve back into the board and torn power on. Unit should fire.
8. If the unit fails to fire, Replace the gas valve.

Its not a good code to get. Hope this helps

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2 Answers

Have an error code GVP


You didn't indicate what model heater you have, but here are some of the fault codes you might see. Could it have been GVO? You can download a manual for your exact model at www.raypak.com
BD1 Board failure
EEP Microprocessor error
FAN Blower pressure failure
FFL Flame sensing when pilot and gas
valves are closed
GVC Gas valve closed
GVO Gas valve open
HL1 High limit switch #1 open
HL2 High limit switch #2 open
IGN Ignition failure
ILO Ignition lockout - Propane units only
PRS Water pressure switch open
ROL Heat roll-out safety switch open
SNS Sensor failure, Water temp. below 36°F
or above 110°F
VNT Vent switch open

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