My hot tub over heats to the point it has ruined the cover. It blistered it on the side next to the water. This happenns with the temp set to less than
100. I cant find anything wrong with it. The temp sensors have been replaced , the controller has been replaced even though there seemmd to be nothing wrong and it still gets too hot. I thought maybe the heater was coming on when the pump came on even when it wasnt suppose too so I connected a lightbulb in paralell with the heater. After 2 weeks of monitoring I never once found the heater energized when it was not supposed to beCan the water get hot just through pumping?