Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 2 of 2

Thread: Pentair Mastertemp 400 not working

  1. Back To Top    #1

    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.

  2. Back To Top    #2

    In the Industry
    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Pentair Mastertemp 400 not working

    SFS = Stack Flu Sensor......

    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.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts