Question about Jandy Laars Lt 400,000 Btu Heater

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Pilot is lit but when i turn the thermostat up the heater will come on. installed new thermostat but still will not heat pool?

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Do you change the sensor that come with the termostat? do you have a automatic control may be a temp sensor is bad ? last the pool take one degree per hour to heat are u give enough time?

Posted on Oct 16, 2009

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1 Answer

How do you light the pilot


Turn the gas knob to the pilot setting, press it in and hold it. You should hear gas escaping while in this position. Do not let more than about 10 seconds of gas out at one time as it may pool. Light the pilot while holding the gas knob down for a minute. Release the gas knob (the pilot flame should stay lit) and turn it to the ON position. To make sure the gas heater is working properly, turn up the thermostat and see if the heater heats up. How To Light The Pilot Light On Gas Heater

Oct 19, 2016 | Heating & Cooling

1 Answer

Hayward spa pool heater pilot on, heat does not ignite burners


Don't really think the gas company would be checking your pool heater, they most likely just checked their gas connections. I would suspect a few things; control module, thermostat, gas valve, pressure switch. You say you get pilot light, and as long as it doesn't turn off and on, as if it is not being sensed, then I would suggest the control module is fine. If the pilot and main burner is controlled by the same valve, and your pilot light stays lit, then I would suggest the thermostat is fine. I take back the pressure switch since the pilot will ignite. I would check power to the gas valve solenoid and see if the control module is trying to open the gas valve. I would suspect low voltage, probably around 24v. If voltage is present and no gas, I would say you found the problem.

Apr 09, 2013 | Hayward H Series Pool & Spa Heater...

1 Answer

Teledyne laars xe pool and spa heater


look inside on panel directions if not turn to pilot setting hold down button light under where small silver line goes under while holding down button when lit keep holding for about a minute then turn to on should stay lit if wont stay lit need new pilot generator

Jun 09, 2012 | Teledyne Laars Laars Lite 2 Pool Heater...

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

Hi I have an Hayward H Series pool heater and the pilot doesn't stay lit when I depress the control to turn it on. Any quick solution for that ?


Check the thermocouple that the pilot light heats up. If it is not working then the gas to the pilot will not stay on.

Jul 01, 2009 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

Pilot light is lit, but heater will not fire


Make sure thermostat is set higher than water temperature. Make sure pump is running and water is flowing through unit. If gas valve is not opening then flame sensor or gas valve is bad.

Jun 02, 2009 | Hayward 250kbtu Ng Pool Heater - Inground

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