Check safety circuit and see if high limits are corroded also see if fusible links are tripped
the fan wont turn on because of the high limit fault from the last cycle. if the high limits are corroded then u should replace them. if the fusible link has opened then u had a roll out situation from clogged heat exchanger, downward draft, blockage in venting. also check internal bypass and thermal regulator to see if theyare seized. this will also cause a high limit fault. high limits open once water temp has reached 135 degrees. water can be boiling inside the headers
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SOURCE: Jandy LX250 LT Pool Heater High Limit Switch
Jump the High limit switch. If it fires the switch is bad
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: where is the hi temp limit switch located?
where is the high temp limit switch located on my laars 44000 pool heater
SOURCE: My jandy LT heater leaks water out of the
I have the 250000BTU version but I believe they are the same in this regard.
It is far more likely to be simply that the low pressure detection copper line sprung a leak or is loose and perhaps dripping onto the limit switches. In and around the same area as the 2 hi-limit plugs is a small flexible copper tube (like for a refrigerator water line). Check that connection for a leak. The other end of that pipe is in the wire chase above the front panel. If you need directions on how to open either panels just ask.
SOURCE: I have an inground pool
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.------------ Actually, when this light comes on, it's most likely the hi limit temp switch that's not working. You need to remove the low and high temp switches, clean them and refit it.Many of the times it solves the problem without replacing the switch.But if cleaning the switch is not helping then it has to be replaced. To locate them simply look on the outisde of the heater on the underside of the external water pipes that exit the right side. They are behind small silver plates with two screws in them.Remove the screws and switch will be out. ----- The hi limits are auto reset. pull the cover off of the side were the water connections are. Make sure the wires are connected to the sensors there are 2 . You can use a meter and ohm check the switches to make sure they are closed it not replace the open one. --------- This will help.Thanks.Helpmech.
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something caused the high limit to open. rare they fail all on there own unless wiring has been chewed
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