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Thread: Pentair MiniMax NT Won't start/work

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    Pentair MiniMax NT Won't start/work

    I have a Pentair MiniMax NT that won't work.

    The control board flashes between two displays.

    1. all these lights are on: Power, Pressure, Service, Remote, Pool, Spa, and Off.
    the display reads: 88.8

    2. These lights are on: Power and Pressure.
    the display reads ---

    the fan never comes on. I have unhooked the pressure switch and jumped the two wires and this doesn't change anything.

    I'm wondering if it is thermostat? That light never comes on?

    Any Help?

    God Speed,
    Houston, Texas
    18000 gallon in ground pool, Cartridge Filters, 2.5 HP pump, white plaster finish. Pool built in 2005

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    In the Industry
    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Pentair MiniMax NT Won't start/work

    Temp sensor.

    Get one, unplug the old one from the back of the board and then plug the new onto the board. Turn on heater. If everything runs as it should, blower comes on, unit then lights and heats, you found your problem and then install the new 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.

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Pentair MiniMax NT Won't start/work

    When mine gets weird, I've had good luck killing all the power at the circuit breaker for a few minutes, then turning it all back on. You might try it - it doesn't cost anything.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    dafuzz's Avatar
    Join Date
    Apr 2013
    North Florida

    Re: Pentair MiniMax NT Won't start/work

    I kill the power to mine when it starts this mess as well. Sometimes 5 minutes, sometimes it takes 30 minutes. I'm going to have it professionally serviced, I'm a little weird about natural gas and electricity
    ~31k gallon 18x36 IG, Vinyl LoopLoc Sahara, Hayward C-750 75sq' Cartridge filter, Pentair Intelliflow VS3050, SGS Breeze760 SWG, Homemade Aerators, SmartPool Nitro 52 Wall Climber, TFT100 XL, Borates, and a partridge in a pear tree :)

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    Re: Pentair MiniMax NT Won't start/work

    I had the exact same problem and I just replaced the thermastor. If you order the part online you can get it for about $35 but I needed it right away so I went to the retail pool store and it cost me double - $70. But it did work. Just shut off your filter and pumps and any electrical going to your heater. Open the front panel where the controls are located and the side panel where the water is piped into. Behind the side panel you will see the water header. There are about 4 plugs that screw into the top of it. The second one from the left should be your thermastor. It will most likely have a yellow wire attached to it. Just unscrew it, disconnect it from the front panel, install your new thermastor by adding some teflon tape and screw it in and connect it to the front panel. viola! It worked.

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