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Pentair Minimax CH 150 natural gas pool heater will not turn on. I have jumped the TH/PP to the TH and the unit will run though. I have also jumped the high-limit, safety, pressure, and rocker switches with no changes. Since I cannot find any faults in the safety loop I am considering replacing the Electronic Thermostat (471677) but would like some advice first.

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  • scottlong67 May 22, 2011

    Gas valve opens when jumped and closes when jump wire is disconnected. Have not had a problem with it staying open. Again, the issue is that it will not fire up when turned on and thermostat is turned up. Was intermittent before it quit altogether, Would appreciate another opinion. Thanks.

  • scottlong67 May 23, 2011

    Thank you.

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Hi,

Before replacing the t-stat...take the wires off at the t-stat and twist them together....heater should fire...if not then the t-stat is not the problem, it is in the wire...if it fires then replace the t-stat, but make sure that the t-stat you use will work with a "millivolt" system....

I think there is a good chance that your problem is the t-stat, but it will be best to make sure of it first.

heatman101

Posted on May 23, 2011

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Sounds like a thermostat problem .Check the gas valve for voltage when it has reached the set temp if voltage is not present and valve still firing replace the gas valve .If voltage is present then the sensing bulb in the thermostat is bad /out of range.The thermostat needs to be replaced.It is possible that your thermostat is out of calibration or needs to be replaced. -------- This should help.Thanks.Helpmech.

Posted on May 21, 2011

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