I have a Mastertemp 400. When starting, the blower kicks on and ignites. It will heat for 15-20 seconds then stops firing ( blower is still going). It will reignite and stop firing in another 15-20 seconds. At this point it shuts off and I get a service heater light. There is no error code. I have totally serviced my heater and am very familiar with its inner workings. I took the cover off and an not seeing any led warnings. I took off the thermal regulator and tested it. It is fine. I ran...
Pentair Mastertemp 400 i
Pentair Mastertemp 400 i
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