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Thread: Pentair mastertemp 125 Heater Not Working

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    Join Date
    Jun 2016
    Location
    salem/wi
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    1

    Pentair mastertemp 125 Heater Not Working

    I have a Pentair Mastertemp 125 heater that was purchased last June. It was used for 7 weeks last year and 2 weeks this year and has now stopped working. It starts fires up and then quits, no codes. Repair man came out checked the pressure switch which he said was ok and said that heater is overheating, pool water is out of balance, heat exchanger is most likely full of calcium deposits and basically throw the heater away, warranty not valid. Is this possible? Is there anything I can do to try and fix this? I just paid almost $1000 to just throw it away !

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    Casey's Avatar
    Join Date
    Apr 2007
    Location
    SW PA
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    10,157

    Re: Pentair mastertemp 125 Heater Not Working

    Welcome to TFP. Bumping to get you answers. Don't pitch anything. Well try to help.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    TFP Guide

    Join Date
    Jun 2012
    Location
    western NY
    Posts
    1,557

    Re: Pentair mastertemp 125 Heater Not Working

    Paul will be along sometime today to help. He is good with these things
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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