Question about Pentair Minimax NT Heater

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Minimax NT heater is knocking. Could it be gas

Minimax NT heater is knocking. Could it be gas pressure? Is there an inlet filter I can check to see if clogged?

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More often than not this will be the by-pass and thermal regulator. Both of these are inside the water manifold on the side of the heater. I will usually replace both if one is bad. If one is bad the other can become damaged and the labor and parts to do this are a big part of the job. Also check and see if you have a by-pass on the plumbing going to the heater. This will be a valve bridging the water in to and out of the heater. If you have one it should be 80-90% closed so it forces water through heater. If any of these are bad it will let water go past the heater and the water inside the unit will overheat and turn to steam and with no place to go it just expands and starts banging.

Posted on May 17, 2010

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Assembly valve need to be replace

Posted on Sep 13, 2009


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