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Thread: Pentair Mastertemp 250 Issues

  1. Back To Top    #1

    Join Date
    May 2015
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    Oklahoma City/Oklahoma
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    Pentair Mastertemp 250 Issues

    I have a Pentair Mastertemp 250 heater that's having some problems:

    -temperature control only allows increasing the temp, can't decrease it
    -cannot turn off manually with "Heater Off" button (you can hear a click, the lights turn off, then it immediately turns back on)
    -can't switch from Spa On to Pool On (immediately switches back to Spa On right after pressing Pool On)

    I ordered a new control panel board and it fixed the temperature control issue, but added the Spa On problem. After looking at the owners manual, I didn't find much in the troubleshooting section that related to these problems. I've had to turn off the gas and circuit breaker for it to turn it off.

    Any ideas on what I should check next?

    Thanks!

  2. Back To Top    #2

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    Pool Clown's Avatar
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    Re: Pentair Mastertemp 250 Issues

    Replace the membrane (touchpad).
    Factory Warranty Station for:
    Jandy/Zodiac, Pentair, Sta-Rite, Raypak, Polaris,
    and Paramount pool cleaning systems.

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    Re: Pentair Mastertemp 250 Issues

    Quote Originally Posted by Pool Clown View Post
    Replace the membrane (touchpad).
    +1. Membrane is the issue.
    Paul
    http://www.gastekservices.com 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,

  4. Back To Top    #4

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    Re: Pentair Mastertemp 250 Issues

    Man, that was simple haha I got the new membrane ordered yesterday. Hopefully that'll solve it

    Thanks guys!

  5. Back To Top    #5

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    Re: Pentair Mastertemp 250 Issues

    Thanks again for the help! I installed the new membrane along with that new control board and everything is working like normal!

  6. Back To Top    #6

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    Re: Pentair Mastertemp 250 Issues

    Just a note. The main reason that those membranes fail is due to the UV rays getting to it. There should be a cover that swings across and covers the touch pad. If it is missing, i would get one. They are a bit pricey for what they are, plastic, but worth it for the protection they provide.

    Part# is 42001-0008S... i think.
    Factory Warranty Station for:
    Jandy/Zodiac, Pentair, Sta-Rite, Raypak, Polaris,
    and Paramount pool cleaning systems.

  7. Back To Top    #7

    Join Date
    May 2017
    Location
    Indianapolis, IN
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    Re: Pentair Mastertemp 250 Issues

    I have a Mastertemp 250 as well that is automatically switching from pool mode to spa mode on its own (even though I cannot do that manually). And I cannot change temperature on spa mode to keep it from heating when it does this. I shut it off on the membrane pad and it actually turned itself on and went to spa mode. It is just over 2 years old so appears to be out of warranty. I have repaired and installed pools heaters on prior pools we have owned so am not uncomfortable working on it myself. However, I wanted to first see if this sounds like just a membrane pad issue before I order one.

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