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Thread: Pool heater cycles off

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    Pool heater cycles off

    My Pentair Mastertemp 400 pool/spa heater cycles off starting around 91 degrees with the temp set to 100. I took off the control panel cover and observed the unit while it was running. The LED indicator light never came on to indicate a problem even though the Service Heater light came on when the unit shut down. What is my next step?

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    In the Industry
    Pool Clown's Avatar
    Join Date
    Sep 2008
    Silicon Valley, CA

    Re: Pool heater cycles off

    Check the thermal regulator.
    Factory Warranty Station for:
    Jandy, Pentair, Sta-Rite, Raypak, Polaris,
    and Paramount pool cleaning systems.

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