I have been scouring the net looking for knowledgeable persons and found this forum...

I recently purchased a used tub. The previous owner had installed a new 2spd pump though had problems with GFCI tripping. I bought the tub, re-installed the pump and had a great time for 2 months--then it tripped. I replaced the pump after eliminating other components, no luck. I replaced two small relays on the motor circuit and the main relay for the pump and heater, no luck. When I plug the pump into the control unit, the pump will spin briefly and then the GFCI trips....Any help would be MUCH appreciated.