Question about Hayward 250kbtu Ng Pool Heater - Inground

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The pilot light is on, but the heater is not lighting. there is not heat going into my pool.

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Check thermostate connections; or maybe batteries in digtal thermostate

Posted on Sep 06, 2009

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I am a new homeowner. I have an H400IDLunit that is a pool/spa combo. The code reads "00" in the heater window and does not change when the unit controlls are pressed. I have an aqualink...


I don't know if there is a pilot light, spark ignitor or thermal ignitor. I would determine by inspection what kind it has. If you open the front cover you will find a gas valve. It can be identified by following the gas pipe that enters the side of the heater and attaches to the gas valve. If the valve has a control knob on it that has an off, on and pilot position then it is a pilot type. If this control is not on the valve then the unit includes an automatic ignitor.

To light a pilot equipped system place the knob in the pilot position, push it down, and use a flame to light the pilot. If you hear gas flowing from the pilot but it won't light then there is air in the line and it needs to be purged. Holding the pilot lighting valve down long enough will purge it but may take a long time. Periodically you can check it by trying to light it. If it lights watch it for a while before trying to turn the heater on to make sure it is fully purged. Once the pilot is stable and the thermocouple is heated the pilot valve can be released and it should stay lit. If not, try again.

Don't get down and look into the burners while you are trying to start the system because it could flame out and burn your face. If you turn on the heater again then the gas valve should come on and the burner should light. You can usually hear a loud snap when the gas valve come on. You should then hear the gas flow to the burner. If the burner doesn't light you should be able to smell the gas. If it lights exhaust will be coming out of the vents in the top of the heater.

I am sure you will have more questions so please respond with them. I hope this helps.

Sep 04, 2011 | Hayward H-series Electronic Gas Pool...

1 Answer

My pool heater doesn't come on. The pilot is lit, and the valve to the ON position. I turn the front knub to heat but when I turn the switch on the front panel to ON it doesn't fire on (...


If your pilot light is lit, then you do have some gas flow, so it is probably the thermocoupler (the part heated by the pilot light) that is not telling the gas valve to open the main line. Sometimes it is just a case of residue on the thermocoupler that is not letting it get up to temperature and sometimes it has been knocked out of alignment and the pilot light is not putting direct heat on it.

A cleaning with steel wool (don't overdo it) would take care of the residue, and you can GENTLY move the thermocoupler back over the pilot flame. If neither of that helps then replace the thermocoupler.

Jul 01, 2011 | Hayward 250 1 Millivolt Propane Pool...

1 Answer

I have a Pentair Minimax CH 250M pool heater. When I opened my pool, the heater started up fine and heated the pool initially. However, since the initial heater it has not come back on, and the pool is...


Do you have 24V at the brown wire of the gas valve? If you do then it is probably a bad gas valve.
If you don't have 24V on the brown wire it is probably the ignitor.

Jun 04, 2011 | Pentair Minimax Ch 250,000 Btu Natural Gas...

1 Answer

How do you light the pilot of a Hayward Heatmaster 400


If you have a pilot that need's to be lit you turn your gas valve to pilot and hold it down while you light the pilot and keep it down for 30-40 seconds to let the thermopile heat up enough to hold the gas valve on by itself. Then turn the gas valve to on.
Most heaters now will have an electronic ignition for the pilot or a hot surface ignitor. If you have power going to the heater then you have one of these heaters.
Let me know how you do. If it is one of these we can go further. Good luck.

Jan 31, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

My pool heaters starts to hum and the service light comes on


millivolt heaters generate their own power from the flame on the pilot max is usualy 750 millivolt, check all connections clean and secure.
Mmake sure the pilot is lit

Dec 31, 2009 | Pentair Minimax Ch 400,000 Btu Propane...

1 Answer

The pilot light on my pool heater is on but I am not getting any heat. Sometimes the flame appears but it is not staying on (not the pilot light).


My problem has been solved. A friend looked at it and discovered that I have a short in one of the wires. Thank you for your quick response in this matter.

Aug 21, 2009 | Jandy TELEDYNE LAARS GAS VALVE, PROPANE...

1 Answer

Pilot lights but won't stay light on release of Pilot button


Replace the thermocouple that the pilot light heats up to keep the gas on.

Jul 07, 2009 | Hayward H-series Electronic Gas Pool...

1 Answer

I have a Mini Max 100 pool heater. The pilot


check pressure switch for proper adjustment and make sure filter is clean so system pressure is normal

Jun 07, 2009 | Pentair MiniMax 100 Aboveground 100,000...

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