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Thread: Pentair MasterTemp 400 switches to SPA mode on its own

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    Pentair MasterTemp 400 switches to SPA mode on its own

    My pump/filter systems is turned on nightly via timer switch. The heater (purchased new April 2014) is set to 81 degrees and had worked fine until last week.
    For some reason the heater now automatically switches itself into SPA mode. I wake up and the pool temp is through the roof!
    Any feedback appreciated.

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    Re: Pentair MasterTemp 400 switches to SPA mode on its own

    Which automation system do you have?
    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,

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    Re: Pentair MasterTemp 400 switches to SPA mode on its own

    Hi Paul,
    If by automation you mean timer, then it's an Intermatic E10694 mechanical timer/switch.

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    Re: Pentair MasterTemp 400 switches to SPA mode on its own

    Oh so you just have a timer. So you manually turn the heater on and off then?
    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,

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    Re: Pentair MasterTemp 400 switches to SPA mode on its own

    I had the exact same problem yesterday! There is no timer on the heater, only the standard pushbuttons to turn it on and off.

    The only thing that was different is that the previous day I turned it on intentionally for about 5 minutes, then turned it back off. There's no reason I know of that it should have automatically came back on the next day. At the end of the day, the whole pool was over 100 degrees.
    I am about ready to disconnect the power from it if I can't find a good reason so I can prevent it from happening again.

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    Re: Pentair MasterTemp 400 switches to SPA mode on its own

    Agreed. I now daily/manually turn the system on and reset to POOL mode. I can then walk away unworried.
    Still looking for answers…PentAir says they've never heard of this before.
    HELP!

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    Re: Pentair MasterTemp 400 switches to SPA mode on its own

    Hmm, replace the system board and see what happens.
    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,

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    Re: Pentair MasterTemp 400 switches to SPA mode on its own

    Quote Originally Posted by ps0303 View Post
    Hmm, Have Pentair replace the system board and see what happens.
    You should still have some kind of warranty, even if you installed yourself.
    Factory Warranty Station for:
    Jandy/Zodiac, Pentair, Sta-Rite, Raypak, Polaris,
    and Paramount pool cleaning systems.

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    Re: Pentair MasterTemp 400 switches to SPA mode on its own

    I know this is an old thread, but just had this same problem with my MasterTemp 400 (installed August 2016). When the Intermatic timer kicked on, the heater would "boot up", then go into Spa mode. My temporary fix for this was to lower the Spa temp setting to it's lowest value.

    Pentair customer service and local pool service both said the membrane control panel is bad. Service guy says he has replaced many of these. I'm currently in the process of getting mine replaced under Pentair's warranty.

    If you're out of warranty or want to do it yourself, the membrane (with connector) is available on Amazon. Looks like a simple repair.
    16K In-ground, Free-form 16'x30', 3.5'/6'/4', Gunite, Original Build ~1996, Renovation 2016, Wet Edge Luna Quartz (Aruba), Travertine Coping, Pentair Globrite LED light, 1 Skimmer, Pentair WhisperFlo 2.0Hp Pump, Hayward Sand Filter, Pentiar MasterTemp 400K BTU Heater, Hayward Variflow XL Multiport Valve, Pentair 320 Clorinator (mostly unused.. Thanks to BBB!), Kreepy Krauly Cleaner, TF-100 Test Kit

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