Question about Pentair Mastertemp Heater
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Posted on Jan 02, 2017
The thermistor is probably failing and needs to be replaced. You can probably replace it yourself. We sell the part at www.arrwomotor.net
Posted on Jun 14, 2009
Inside the water manifold their is a by-pass asembly that may be the problem. If this is bad it will let to much water go past the heater rather than through it. The water inside the heater overheats then shuts the heater down more cool water workes it's way into the heater and it starts again. You may also have a by-pass valve on the plumbing going to the heater, this will give the same problem if not closed enough. You will find it in between the inlet and outlet pipes and it should be closed 80-90% of the way. I hope this helps, good luck.
Posted on May 21, 2010
If this heater has pool mode and spa mode as an option, and you need the water higher than 84 degrees, you must set it to spa mode even if it is a pool. As a regulation, these heaters come pre-set to max out at 84 degrees as a safety feature. However, in spa mode it can reach 104degrees.
Posted on Jan 11, 2011
Testimonial: "Thank you, I will try that tomorrow!"
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