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Update to my situation. I called the pool builder, who confirmed what ps0303 said- it's probably the control board. Just to be sure, I checked the resistance on the thermistor and the wiring between that and the control board, both of which were good. I had the pool guy order the control...

I'm having a problem with my hot tub heater. It's the exact opposite of what most people have (heater not working)- it is actually working TOO well. Let me explain. About a month ago, my son was complaining that the hot tub was overly hot. When I checked it, it felt pretty hot to me too. So...