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Thread: Pentair Mini Max NT Dead

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    Pentair Mini Max NT Dead

    My Mini Max NT heater Model 400 is completely dead. I know this is a bad heater that has been discontinued
    but I need to know where I can get parts.

    Does anyone know why it might be completely dead? Would the controller board possibly be the problem?
    20K IG vinyl, 3/4 HP Whisperflo pump, Hayward 62GPM sand filter, 3/4 HP Hayward booster with Polaris cleaner

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    Melt In The Sun's Avatar
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    Re: Pentair Mini Max NT Dead

    Welcome to TFP!
    I guess the first part is to make sure it has power...after that we can move forward. I'm not much help on these things but there are plenty of folks around here who are!
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    JasonLion's Avatar
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    Re: Pentair Mini Max NT Dead

    Various places sell parts, for example these people.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Pentair Mini Max NT Dead

    I have tested and it looks like I have power to the control board but after that I am not sure where to test.
    20K IG vinyl, 3/4 HP Whisperflo pump, Hayward 62GPM sand filter, 3/4 HP Hayward booster with Polaris cleaner

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    Re: Pentair Mini Max NT Dead

    Welcome to TFP!!

    If it gets power, it should be able to give you error codes when it tries to turn on. The error lights are on the back of the mother board and also check the Fenwall for flashing lights (this might not apply to your heater, but is true for the MasterTemp and Max-E-Therm heaters).

    Can you tell us what happens when you try to turn on the heater?
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

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    In the Industry

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    Re: Pentair Mini Max NT Dead

    Quote Originally Posted by mrpbjnance
    I have tested and it looks like I have power to the control board but after that I am not sure where to test.
    If you get ~24VAC on the orange and white wires coming from the transformer, and there are no LEDs lit on the control board, you need a new control board.
    20X40 30,000 gallon gunite pool

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