Question about Jandy LAARS LX400 - NATURAL GAS, DIGITAL READ-OUT, LOW NOX

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

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

Posted on Jul 26, 2009

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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

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1 Answer

Message says hi lim sw


replace hi limits ther are 2 of them

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1 Answer

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

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1 Answer

Fan for the heater will not come on showing service HI LIM SW on screen


That would mean the high limit switch. Check it and see if you can reset it. It may have gone bad. Check first and if needed find a replacement part. Good luck...Lee

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Laars LX400 Air Flo SW Error


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

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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

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1 Answer

Hi Lim SW fault when trying to heat pool.It is a Laars lx 400,000


heater over heated check gas pressure then replace high limits also make sure chemicals in balance

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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

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