I have an early 90s, 3 person, tiger river hot tub. From time to time the controller will trip out. It's not the ground fault tripping. I have to turn the temp control all the way off and then back on to reset the controller. What could be causing it to trip out? I'm going to wire an LED into the circulation pump to see if it's shutting down when the controller trips out. I know the heat does. It is so agravating to go to get in the tub when you have a sore back and find the water is cold!!!!!