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Laars Lite 2 pool heater will not fire. Pilot is on and I replaced the pressure switch. Had a similar problem at the start of the season but left on for a few hours it finally kicked in.Water pressure in system is good.Filter has been cleaned and backwashed several times.Not sure how to check switch and temp. setting dial. Thanks M.M.

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I believe that the Laars Lite 2 heaters are a millivolt system . There is a thermopile in the pilot assembly that produces about 500 millivolts DC. This is the power that the gas valve uses to turn on. These pool heaters are notorious for getting resistive connections that restrict the flow of electricity through the circuit. A connection that looses 1/4 volt is no big deal with 110v but in a millivolt system that is half of your power. Start by checking the output of the thermopile then go through the entire circuit and clean every connection with sandpaper. usually this will fix it but if not then you will need to isolate each individual component to find out what is not passing power.
Good Luck,
Chillmaster

Posted on Jul 29, 2008

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