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Pool heater won't stay lit

Pilot will light. will run for 10 min or up to an hour & shuts off. pilot stays lit. pilot generator putting out about 500 mv w/pilot lit. when it runs it may go down to about 300 mv. Need to wait about 3 hours before it will relight the burners. Pilot never goes out. I have jumpered past the switches, (fusible link, high limit switches, pressure switch, fireman switch & on/off switch). Still don't hear the click of the switch in the gas valve. Also I must start from scratch,shut the gas valve off, relight the pilot & turn the gas valve to on before I can get the burner to start again. tested potentiometer w/ohm meter when working & not, ok. I have a sealed circuit board that I don't know how to test & not sure how I can test the gas valve. These are pricey items to replace & be wrong. No local service available, an out of town service call or the wrong repair would put me at almost the cost of a new heater. Any help would be much appreciated. thanks.

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  • mykewrench Jun 04, 2009

    problem solved. circuit board had the wrong resistance. fabricate as needed, works great.

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  • Teledyne Laars Master
  • 4,292 Answers

Check gas pressure might be running out of pressure gas meter might be too small and heater could be overheating

Posted on Mar 19, 2016

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Posted on Jan 02, 2017

  • 139 Answers

SOURCE: hayward heater not staying lit

possibly poor pilot adjustment or insuficient mv output from thermopile

Posted on Jun 19, 2009

  • 139 Answers

SOURCE: pilot lit clicking noise no burner

make sure knob on gas valve(inside heater)is turned to on position.3/4" should be fine as long as heater is not larger than than 175,000 btu

Posted on Aug 11, 2009

  • 1 Answer

SOURCE: My Jandy LT 400k heater shuts off when the fan

heater comes on for about 2 minutes then service light comes on and so does the ags light

Posted on Jan 27, 2010

  • 990 Answers

SOURCE: Model LG Lite 2 pilot is lit but the burners will not light

If this is a standing pilot you will want to check your voltage out put from the pilot. For this you will need a milivolt meter. The pilot should supply 500-700mv (1/2-3/4v) It only takes 200mv to open the pilot valve but needs another 300+ to open the main half of the gas valve. This would be the first thing I would check. If this is the problem you will need to replace the pilot assembly. If your getting the power you need from the pilot then it is probally your gas valve itself. Good luck.

Posted on Apr 25, 2010

  • 3 Answers

SOURCE: Teledyne Laars LD250 Propane Pool heater cycles on and back off

Do you replace the thermopile or check the milivolts?
Check the Pressure gas
You need replace all of them terminals and check again the milivolts at the gas valve

Posted on May 29, 2010

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