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Jandy LX250-L Burner shuts down and no errors

My Jandy LX250-L is shutting the burner off before set point is made, without any error message from either the flame current monitor or the display. I was testing the flame burner tonight and all seems well with approx 7.0 ua dc at the Fenwal Controller. I can start up the heater and it will run for approx 30 minute heating the spa and around 95-98 degress the system just shuts down, the gas valve closes and the blower runs for appprox 2 minutes and the system just stops. I can wait for the heater to cool approx 5 minutes and restart it and it will run until temp reaches 98 and it shuts off again. I am thinking it might be a bypass valve problem. PLEASE HELP....

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  • Karl Peterson Nov 30, 2012

    Does the high termp sensor reset itself after cooling?



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It is more likely the board on the LX.
If you have a volt meter check the IND connection on the Fenwal for 24volts while running and keep your meter on it until it shuts down. If the power is still present at the IND while shutting down then it would appear to be a Fenwal problem. It sounds like the temp circuit on the board or the temp sensor it self is bad. Try dipping the temp sensor in a glass of water with a confirmed temp to see if it is accurate.

Posted on Apr 08, 2017


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You are right about the ignitor. Depending on how old your heater is. The ignitor can become weak and flame rectification will be intermittent. You may have to replace the ignitor assembly or at lease check to see that it's not corroded enough to impede gas flow.

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SOURCE: I have a Jandy Lite

This sounds very much like spider webs in the gas orfaces. If you shut the power off and remove the wires to the gas valve then shut the gas down and remove the fed pipe from the gas valve you should be able to pull the burner tray out of the heater. Now if you remove the burners you should be able to remove the brass orfaces connected to the main gas feed pipe. If you use an air hose or a can of compressed air you can blow this out now. Now take the orfaces you removed and clean them with a tooth pick or a small piece of wire. The webs will look like small cotton balls or lint. They don't stop the gas they just slow it or disperse it and keep it from firing clean and evenly.
At this point you can reassemble the tray and install. This should fix your problem.

Posted on Nov 14, 2010

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