I've got a Hayward sand filter and pump with the motor that was supplied with it. Last night the pump was running fine when I shut it down about 10- ran late since I had shocked the chlorine. This morning when I went out to turn it on the motor came on momentarily then stopped. Turned it off then back on again and same thing. The ground fault did not trip. Shut off the switch then opened the strainer basket which was plugged - cleaned that and tried again but absolutely nothing this time. Shut it down again, opened the strainer basket and stuck my finger into the impeller housing ...it spins freely so I know it's not bound up and since it's a direct connection to the motor that doesn't seem to be bound up either.
I know I have power from the circuit board so it is not anything in the feed line. I unwired the pump from the switch and tied a plug onto and plugged it into a live socket ...nothing. I'll guess it is something to do with the "stuff" inside where the power connection is made to the motor - capacitators etc. I've checked all the 110 connections back there and they are tight. Anyone have any ideas?