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Thanks for the reply. Last that I was in the pool, the temperature was approaching 85 degrees and the knobs on the heater were on full. It was when I tried to turn it off is when I noticed it would not shut down. Someone recommended that I look into a new electronic thermostat. I would like to...

Opened my pool this year and everything was fine. Now my heater will not shut off unless you shut the gas off. Is there a way to test the electronic thermostat .

I have a Pentair Minimax 250 that is about 10 years old and was working fine until a week ago. The trouble that I am having is that it will not shut off unless I shut off the gas. I have been advised to replace the electronic thermostat. Please advise.