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    Strange problem with Pentair Mastertemp 250 - shuts off after many hours

    Hi all, I have an unusual problem with my 2015 Pentair Mastertemp 250. It ignites just fine (igniter recently replaced) and brings the pool up to set temp just fine. But then, while maintaining the set temp (usually after 8-12 hours), it randomly shuts down and the Service Heater light lights...