Question about Jandy Laars Lt 400,000 Btu Heater

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My Jandy LT 400k heater shuts off when the fan transitions back to high speed about 30 seconds after burners light. The gas pressure is about 13.8 and the regulator is at 9 inches at the manifold side of the valve when the burners are lit. I have jumped around the high limit, 135 and 150 limit, water pressure switch, fusable link and air pressure switch. Something is shutting off the gas valve about the same time the fan gos back on high or the fan is blowing out the burners and the flame sensor is shutting it down. I remove the fan and there are no blockages I can see... what next? I am not sure where to go from here. Any suggestions

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  • michael_ludw Oct 01, 2009

    Flame sensor at control unit measured 7.7 micro-amps. Adjusted damper to close off air opening below the burners (about 50%) and the flame no longer goes out. So the problem was it was running too rich and by increasing draft via burners damper the issue is resolved.

  • michael_ludw Oct 15, 2009

    joespools200,
    No I am not a pool guy, but did run service for HVAC back in the 80s and understand the basics but it doesn't need answering as I finally figured it out.

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

Posted on Jan 27, 2010

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My guess is you are a pool guy so im not going to awser this one

Posted on Oct 15, 2009

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