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: I have a Laars LT
flame sensor is dirty or faulty.for starts,remove it and clean with steel wool or fine emory cloth.
SOURCE: Pool heater will light then turns off
check gas pressure you should be getting about 10" water coloum
SOURCE: Jandy LAARS LT pool heater blows out the fusible
check for a heater that is leaking current to the water jacket and this would be a ground and if enough current leaks to ground it will open this link you can check this by undoing the heater,then if its ok then you know its the heater or by checking with an ohmmeter
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