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My 10yr old Pentair Mastertemp worked fine until now. It shuts off at 90 degrees, resets and refires after two minutes, then runs a minutes, then shuts off and repeats, so it takes15 minutes to go from 90 to 102. I replaced filter, thermistor, thermal regulator. Flue stack sensor reads 250, No...

Forty year hot tub and do it yourself. Having some spa heater issues, and could use advice. Send redwood/cedar hot tub questions here. Neil Adler

My Pentair Mastertemp 250 (2006) has worked perfectly for years heating my hot tub to 103 a few times a month. Suddenly the temp fluctuates between centigrade and fahrenheit, and shuts off at 100. Then it goes thru the 90 sec purge and fires again for one minute, then again shuts off and...