Question about Jandy LAARS LX250 - PROPANE, DIGITAL READ-OUT, LOW NOX

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High limit my heater is flashing a high limit

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That means you need to replace the high limit assembly

Posted on Mar 04, 2009

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My temperature says HI. but my temp is not warm


The error code is HL, not hi
This is telling you the high limit switch is tripping(safety feature)
Lack of flow, corroded heat exchanger, bad high limit switch, bad thermal regulator.....
Take these steps to try and get it narrowed down.
With heater off
Locate the high limit switch, unplug the two wires connected to it, put a jumper wire in between those two wires. Turn on the heater, if it fires you need to wait till it heats all the way up. If if heats up with no fault in the cycle then most likely it's a bad high limit switch, if it continues to trip then thermal regulator, it may need both parts.
If it doesn't fire at all then you will probably need a professional

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How to check high limit switch on theme Hester


turn all power off. remove both leads to high limit switch. take a multimeter, set it to OHMS......put leads across high limit switch....if u get a reading then switch is closed. if you get no reading then switch is open

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104 degree limit


there is a white button on the back of the heater control board you can hold it down and raise the temp that way, but yes it is not healthy to have the water that hot it is dangerous to your health

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Jandy Lars LT fans doe not turn on and error flashes hi limit


check safety circuit and see if high limits are corroded also see if fusible links are tripped

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Our artic spa hot-tub is showing HL in the panel and is not heating up as it should. Everything else seems fine. Why?


HL is normally a "high limit" fault. If your filter is clean and you have sufficient flow, you may have a faulty high limit sensor. It should be mounted on the heater itself. The high limit sensor shuts the heater off if it senses excessively hot water. Check to see that you have sufficient flow, clean the filter, and make sure the filter pump is running. If everything else is running properly, you may have to replace the high limit sensor.

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Jandy LX250 LT Pool Heater High Limit Switch


Jump the High limit switch. If it fires the switch is bad

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1 Answer

High Limit Swtiich message


The high limit switch is one part of a safety loop circuit that must work before a heater can fire. It's purpose is to ensure tha tthe heater will shut off in the event of a thermostat failure or if the internal core gets too hot due to a lack of water flow. If the switch is failing, it needs replaced. There are 2 so you can replace both or make an attempt to determine which one is bad. It is best to replace the pair.

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