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PUREX TRITON MINIMAX 400 Pool Heater Control Board: PAC-FAB #MWC052096R1 Unit fails to fire. I am an electrician and I have verified the following: 24VAC IS PRESENT AT TERMINALS J4(GREEN POWER LIGHT ON) SPA/POOL SWITCHES ARE GOOD PRESSURE; HI LIMIT; T FUSE INTERLOCKS ARE ALL GOOD T PROBE THERMOCOUPLE IS GOOD EXTERNAL JUMPER SWITCH IS IN PLACE problem: THE COIL OF THE OMRON RELAY ON THE CONTROL BOARD WILL NOT ENERGIZE. IF I TEMPORARILY JUMPER THE OMRON RELAY'S POWER CONTACT THE HEATER WILL FIRE (WITH ALL SAFETY INTERLOCKS FUNCTIONING PROPERLY)- BUT OBVIOUSLY WITHOUT TEMPERATURE CONTROL. ALL led's ILLUMINATE GREEN. ALL EXTERNAL CONNECTIONS TO THE BOARD SEEM TO FUNCTION PROPERLY - BUT THE RELAY WILL NOT ENERGIZE! I REPLACED THE BOARD WITH A NEW UNIT (pac-fab #MWC052096R1) BUT IT DOES THE EXACT SAME THING. WHAT AM I MISSING HERE?

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  • wlm_ecu Jul 28, 2009

    PROBLEM IS SOLVED!!!
    The temperature probe was the culprit. I got great help from Brian Frickman of PENTAIR.
    The probe is easy to replace and I found one locally for around $35.
    The probe is a 10 k ohm rated unit. Mine was internally grounded.

  • Anonymous Mar 26, 2014

    I have correct power to my control center, pumps work when I jumper them. Have tested resistance on all visible fuses, they seem to check out fine. I have no illumination of the key pad and so no pumps, no heat, etc.

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DId yo find the problem? My heater is doing the same thing.

Posted on Jul 28, 2009

  • tward6676 Jul 28, 2009

    I replaced the board as well, but does still has the same problem. Please let me know if you were able to figure out wat was wrong.

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