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Thread: Pentair MasterTemp 250 not firing

  1. Back To Top    #1

    Join Date
    Apr 2008
    StL, MO

    Pentair MasterTemp 250 not firing

    The display works and is not showing an error code upon startup. It won't start when I increase the heat setting on my MasterTemp or when I turn Manual Heat to on and try to increase the temperature manually on the heater itself. In fact, none of the buttons on the pad - including temperature down and heater on and off - appear to be working. I ran a diagnostic on my EasyTouch panel and got error code 4 - stuck switch. I'm hoping this means I just need to replace the membrane pad on the heater. It's only two years old and I already had to replace the control board. Any thoughts would be greatly appreciated. Thanks!

  2. Back To Top    #2

    In the Industry
    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Pentair MasterTemp 250 not firing

    Inside the heater, you removed the two wire connection to the ET and put a jumper wire in its place? Once you did this, the keypad is not responding?

    Not sure that your diagnostic is telling you what you think. If all you have is a two wire connection to the heater and the ET, there is no way that the ET can tell you what's wrong with the heater. The two wire connection only provides 24V to wake the heater up to start running or to shut it down.

    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.

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