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Thread: pool heater quits

  1. #1

    Unhappy pool heater quits

    I have a TELEDYNE LAARS Lite pool heater.
    Just did spring start up - the pilot light works well.
    the heater starts - stays on for 2 to 5 minutes - then shuts off . I flick the on/off switch to off then on & the heater starts up again ( the water is only low 50s) & the cycle repeats....
    help! thanks ....

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    this is generic, not specific to your heater...

    I'd look closely at the flue to make sure it isn't obstructed - maybe a mouse nest or something like that. It sounds like it is a safety circuit that is shutting it down unless the thermostat is bad. Is the pump circulating the water properly? If not, the water in that small volume of the heater could easily get hot enough to inform the heater it has reached temp. Could be clogged or the flow restricted - maybe some leaves?
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default heater

    You have to test every safety device to see which one is doing it, THEN figure out why. It could be a pressure switch, or a flow switch, or a high temperature switch due to poor circulation,


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