SOURCE: Laars Lt heater will not start- pressure switch light
it is time to check your filter make sure is not dirty and if your filter is clean and still doing this then the problem can be with one of the safety sensors they do have 2 hight limit switch located in the heater heather they re round with two wires on each one turn power off to heater and get a voltemer reader and check the hight limits for continuty they should read zero on your metter it can be your temp sensor heaters are so complicated that it is always good to have a pool tech service it I was a pool tech in california but now I am located in georgia
SOURCE: hi limit switch code
mine were corroded, but passed a continuity test. removing the corrosion opened a hole in one of the cases. $30/ea to replace (parts only). then i read how the brass 'screw' they contact with are prone to corrosion (salt pool), not listed in the parts manual, but are available as part# R0383200 (another $6/ea). not a happy jandy/laars/teledyne owner.
SOURCE: My Aqualink RS Wireless says Pool Heater Jandy
AT THE HEATER PRESS THE BOTTOM TO TURN THE HEATER ON LINE IF NOTHING HAPPEND THE HEATER MUST DE WIRE CHECK YOU MANUAL FOR THIS ONE
SOURCE: Where is the 3a fuse on a Laars lx heater?
I believe this fuse is on the top right of the board under the panel. I could be wrong but two screws on the bottom of the control will let you pull it out and see. But I'm suren it is on the circut board. good luck and let me know.
SOURCE: my laars lx pool heater is blinking LOW PRESSURE.
The heater needs good water flow or it will overheat. You probally have a full basket in your pump or your filter is dirty.
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