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Thread: Pentair Mastertemp 400 not working

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    Join Date
    Aug 2015
    Livermore Iowa

    Pentair Mastertemp 400 not working

    I have a Mastertemp 400 that is not working. IT starts up and runs fine for a minute or two then shuts down and the service heater light comes on and the SFS led is lit . I have had this problem before and replace the thermal regulator and it will work. I have put two new thermal regulators in and it still will not stay running. If I remember right my exhaust temp was around 380 degrees when it was running. The local pool supply store say they think is my heat exchanger. I do have fairly hard water, but before I rip into changing the heat exchanger I was wondering about the stack flue sensor or maybe replacing the high limit switch.

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    In the Industry

    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Pentair Mastertemp 400 not working

    SFS = Stack Flu Sensor......
    Paul A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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