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

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Air flow failure indicated on heater

I have a Jandy lx400 gas heater and it keeps shutting down showing "air flo sw" on the readout. I have checked the switch and it closes when the blower is running but the unit still fails. The company that installed the unit says it could be the fan motor or even the display board which they say costs 900 dollars. Any help?

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Mine does the same. Sounds like you checked the air pressure switch, but the high temp switch and bad airflow can also cause this problem. Check the two white wires that lead to the heat sensor vent drain tube exits. Make sure the spade connectors aren't shorted. Try testing the temp sensor like you did the pressure switch to make sure the circuit is properly closing when in use (or use a temporary jumper to bypass as a test.) Check the bottom of the pan for any dust or crud that could block the airflow below or around the burners and last of my options- increase clearance around the unit to aid air flow.

Posted on Mar 06, 2011

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