Question about Teledyne Laars Laars Lx Pool Heater / 400,000 Btu / Propane Gas

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Laars LX400 Air Flo SW Error

Originally had Hi Lim SW error and replaced both Hi Limit switches.

Now when I turn the heater on, there is no sound for about a minute or so and then the Air Flo SW error comes on.

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Is fan coming on if not bad fan motor also check pressure switch if 24 volts both sides that's ok make sure air flow switch hose is ok

Posted on Mar 19, 2016

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1 Answer

LAARS LX250N-L error code AIR FLO SW and sometimes a HI LIM SW cannot locate the source of the problem?


hi limits are located under where the pipes go into the heater if corroded replace if wires bad replace to test you can jump them at the board only testing if left jumped heater could catch fire

Jun 29, 2015 | Jandy LAARS LX250 - NATURAL GAS, DIGITAL...

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Laars lx400 blower does not come on


check filters or pressure switch sounds like safety switch isnt working

Mar 31, 2014 | Pool & Spa

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Air Flo Switch on


see if hose clogged or hole or collapsed

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My Jandy Pol heater is giving me an error message of Hi Lim SW which I believe means that it has something to do with the High Voltage somethihg or other. Can you please help me?


Thank you for posting your question here on Fixya.com.

Hi limit switched are embedded in the header and trip when the water temperature is too high. Most of the time the cause is either a faulty sensor or poor flow thru the heater causing the exchanger to overheat. If you have a bypass plumbed into the water lines at the heater close it and see if the problem goes away. If not, you'll need to check the limit switches to see if they are faulty or if a condition exists causing them to trip.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!

John

Jun 12, 2010 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Air flow failure indicated on heater


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.

Jun 01, 2010 | Jandy Laars LX Pool Heater / 400,000 BTU /...

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I get a message saying Hi Lim SW when trying to heat my spa. What does this mean


Temp control failure (thermostat) high limit is safety to prevent over heat.

Jul 26, 2009 | Jandy LAARS LX400 - NATURAL GAS, DIGITAL...

1 Answer

Hi Limit Switch error


this may be for two reasons first the water is going to slow make sure filter is clean and either the water inlet plump incorect or the valve assembly is damage and need to be replace the high limit is letting you know the temp is getting to hot inside the heat exchanger

Jun 06, 2009 | Jandy Laars Lt 250,000 Btu Heater

1 Answer

I get a message saying Hi Lim SW when trying to heat my spa. What does this mean?


hi limit switch heating unit getting too hot what type of heater are you using

May 09, 2009 | Jandy LAARS LX400 - NATURAL GAS, DIGITAL...

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