Question about Pentair Minimax NT Heater

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The fan in the heater turns on but the heater does not turn on.

The red service light stays on and the heater light will not come on. I replaced the ignition control module and it still happens. Heater will not come on.

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I have had minimax heater for four years now and have had to replace the circuit board 3 times and the temp control twice these things are junk. Will not buy another pentair.

Posted on Aug 14, 2010

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Probably a bad circuit board. I have the same problem once the water gets above about 82 deg. I tried cleaning the filter and strainer, cleaning out the heat exchanger, replacing the temperature limit switches, bypassing the pressure switch, and cleaning the ashes off the burner, and none of these worked.

Posted on Aug 01, 2010

  • Charles Mashburn Aug 06, 2010

    It could also be a bad thermal fuse. This is located below and behind the gas valve, and looks like a thick wire covered in shrink tube with a spade connector at each end. You can try temporarily bypassing it with a jumper, to see if this solves the problem. If it does, then time to go get a new one.

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