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Thread: Heater won't stay running

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    Heater won't stay running

    Hi. I recently made a repair on my Hayward H100ID above ground heater. The thermistors needed replacing as one broke its connection. I tried starting it up, following the startup procedures on the inside cover. Everything seemed to be going fine, but when I came back in a few minutes there was no heat (fan was still blowing). I shut it down and went through the startup procedure again. Sure enough, I got it running, could feel heat comnig out the vent, but in a few minutes it was off again. We had someone look at it last year as it was starting to do this near the end of the season. The only thing he said was our pool has to be full. Well it is so that is so not the problem. Does anyone know a cause for the heater to keep kicking off? We got enough propane. Thanks.

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    Re: Heater won't stay running

    Water flow could be a problem. If my filter gets clogged up my heater will not run if there is not enough pressure.

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    Re: Heater won't stay running

    The flow seem to be ok, at least when I put my hand on the outlet and feel the force of flow. Other than that, how would I verify sufficient flow?

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    Re: Heater won't stay running

    That is how I determine flow also, lol. It sounds like some sort of safety check also. Good luck, sorry.

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    Join Date
    Feb 2008
    Dallas, TX

    Re: Heater won't stay running

    I may be experiencing a similar issue with my Laars LT 400. Does it backfire? Are any of the burner tubes corroded or blocked?

    Check out this thread.
    31000 Gal IG L-shape w/ spa, Riversand finish (PebbleSheen clone)
    Jandy 60 sq ft DE, 2.5 HP (uprated) Stealth pump, Polaris 280 w/ booster, Jandy PDA PS4 controller

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