Question about Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas

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Teledyne Laar 400k btu heater heater fires but wil not stay on

The heater will cycle light and gas will run as ssoon as full gas flow starts it turns off. the cycle repeat for two or three times then nothing

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  • Anonymous Mar 28, 2009

    Same here

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The most likely cause is a defective limit switch on the header. There are two limit switches, a "high limit" and a "low limit". They are mounted in wells next to brass plugs in the thermoplastic header just below where the water outlet is. They have shiny metal covers over them and you can see the wires going into the wells just below each cover. With time and use the brass plugs begin to seep pool water, corroding the sensors. If the sensors are open circuited the ignition controller will not allow the hot surface ignitor to fire the gas. Even though this is a failure of the limit switch it will show up on the diagnostic panel as "AGS" (automatic gas shutdown) because it is not a temperature limit problem but an "ignition problem."

Posted on May 18, 2009

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  • Master
  • 463 Answers

Flaky thermocoupler.

Posted on Feb 27, 2009

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