My pool heater (Jandy model LX400P-L) doesn't heat up the pool. The panel displays a code "HI LIM SW", a fault description that states a "high limit switch circuit is open". How do i correct and troubleshoot this?
Check the fusable link for voltage on both sides if not replace also check pressure switch
SOURCE: Jandy LX250 LT Pool Heater High Limit Switch
Jump the High limit switch. If it fires the switch is bad
SOURCE: 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
SOURCE: getting error code 188E on Jandy Model LT Lite 2
press the arrow key for 10 sec this will reset the heater. if code replace control board, if not enter time date and set temptures for pool and spa
SOURCE: My Jandy Pol heater is giving me an error message
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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.
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John
SOURCE: Jandy Lite 2 pool heater
Thank you for posting your question here on Fixya.com. If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!
Page 34 and 35 of your manual, found here, describe FL0 as a flow issue most likely caused by dirty filters. Depending on the type of filter you have a good cleaning/backwash will usually remedy that. It is also possible the unit's pressure switch, which senses water flow and therefore reacts to dirty filters when present, may have failed, especially if you winterize the heater in a cold climate and leave water in the switch which can burst the diaphragm inside.
Start with cleaning the filter. If the heater still won't fire jump out the pressure switch while the pump is running to confirm the part is the problem. Assuming it is replacing it with a new pressure switch which should be under $75. The part number can be found in the rear of the manual.
John
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