Question about Pentair Mastertemp Pool & Spa Heater Dual Electronic Ignition 400,000 Btu Lonox Propane 460737

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Thermostat reads 120 degrees but pool is only about 75

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Your temp sensor has gone bad. It is a small tube that slides into the water manifold with two wires comming from it. Follow these to the control board and then unplug them. Now just get a new one and replace. This should fix the problem. Good luck.

Posted on May 15, 2010

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Posted on Jan 02, 2017

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I am not sure if you have solved this issue, or not, but just in case. The problem is the Thermister, or temp sensor. That will need to be replaced since it is reading the water temp at 125.

The Thermister is located on the manifold, left hand side, between the first two bolts. It is pretty easy to change out and this will correct the problem.

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Sorry this is a late response! Hope that it helps!

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