I am pulling my hair out on this. My pump motor runs 1/2 hour to even 2 hours and then the breaker trips. It doesn't seem hot and this is happening even at night. It is not getting wet. I cleaned the cartridge filter and have made sure that the back-pressure is low. I don't see and clogs and the flow seems really good.
I have replaced the 30amp breaker. I have replaced the motor (because it was old and noisy and I thought it was the problem). I have checked all the connections I could get to and have tightened them up. None show any signs of scorching or shorting.
I had the cutoff switch turned off and the breaker still tripped. It is a single throw double pole switch. Could it be a bad switch? I guess I should cap the circuit off there and see if it still trips. I really hope it isn't a short in the conduit underground... that would be really bad. How hard are they to pull a new line through?
If I give up on this is it best to call an electrician or a pool company? I would guess a good electrician would be the better pick.