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Need pool heater help

My pool heater starts for bout 5 mins then shuts off and displays a (GVO) sign and I dnt even know where the gas valve is. Please help

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  • Scott Corey-reid Mar 18, 2014

    GVO is gas valve open. May be stuck open when no call for heat. or theres a problem with circuit board



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Believe you governor bad black fitting next to incoming pluming on right side of heater gas valve inside panel below display

Posted on May 29, 2013


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Posted on Jan 02, 2017

  • 1378 Answers

SOURCE: Hayward model H100ID1 pool heater

The diverter inside your manifold is likely broken. You should stop using the heater immediately as the nocking is from water starting to boil in your heat exchanger. This can lead to a dangerous situation if a limit switch does not act in time.

Pull the inlet hose from the heater and you should see a plate just inside. If you can move it around it is broken and the fix is a new exchanger assembly.

You can fin these online and we sell them at

Posted on Jun 18, 2009

  • 139 Answers

SOURCE: I have a Hayward pool heater. It's about 5 years

would not suggest trying to manually light,its an electronic ign model so you may damage some wires with an open flame.try powering off then turning back on and see if display retuns to normal

Posted on Jun 20, 2009

  • 9 Answers


Sounds like it is cycling on high limit; causes are related to water flow through the heat exchanger or a faulty high limit(doubtful given the heater cycles back on). Check the internal bypass for obstructions; has anyone worked on it recently? There are usually two high limit switches with different trip temperatures; installing the wrong one could also be the culprit. Does the heater "bang" before it goes off (a sign that the water is boiling inside the tube bundle)?

Posted on Jun 28, 2009

  • 1378 Answers


CE is a communications error on the board...the control module and/or Display interface assy. probably need to be replaced.

Posted on Dec 01, 2009

  • 78 Answers

SOURCE: Hayward H400 Pool heater will not stay lit

"IF" - Hayward Pool Heater Fails to Ignite: the most common reason for this problem is insufficient gas supply. The Hayward heater LED display will show a diagnostic fault code of "IF" which stands for Ignition Failure. Undetected gas pressure problems if not investigated properly may result in unnecessary replacement and servicing of your Hayward Pool Heater.

Posted on Apr 23, 2010

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1 Answer

I am getting an error code ags

AGS - Auto Gas Shutoff = Because of a problem sensed, the gas valve is closing, stopping gas supply and hence heater shutoff.
Improper water flow through heater! Check filter, pump, water supply lines, anything that will reduce water flow into heater.
A faulty Pressure Switch may cause this problem as well.
In coming water to heater is over 104°
If all is good with the above, replace the AGS Switch.

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Raypak 2100 206A worked 3-4 times after replacing circuit board, now error code GVO, gas valve open, what does this mean and how do I correct it?

check to see if you have proper gas pressure at unit most people think its the unit but mostly it is too small a gas line or too small gas meter call gas company

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Fault/error code GI/O

the error code you are getting is GVO. means gas valve open or stuck open. replace the gas valve

Aug 29, 2012 | Raypak RP2100 DIGITAL POOL HEATER R265

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How to reset code GVO on pool heater

check safety circuit if ok check gas pressure if ok check ignitor

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1 Answer

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

Mar 21, 2011 | Rheem Pool & Spa

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
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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1 Answer

How do you start the heater for the first time in the spring?I don't know where to begin. The pool pump is on and working.

Make sure all gas is on to the heater and the gas valve inside the heater. Be sure all winterize plugs are in place and tight then make sure all valves are letting flow to the heater. If the heater won't start at this point be sure you have enough gas if it is LP. You need at least 30% in the tanks to get the heater to fire. Then you will have a shut off valve just outside the heater. Shut this off and you will fine a union near this, crack the union open and turn the gas back on for a few seconds till you smell gas then shut off and tighten the union back up. let it sit for 15 or 20 min. to let the gas clear then try again. If it still won't start it may be time for a repairman. I hope this helps, good luck.

Apr 18, 2010 | Sta Rite Sr200lp Max E Therm Pool & Spa...

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