My pool has a two-speed pump motor. When the pump comes on at high-speed, it hums briefly and then shuts off. It keeps trying to start, but all it does is hum. I tested the capacitor, and it was fine. The pump will run on low speed.
With the power leads disconnected from the pump, I checked the voltage for all three leads with the pump on high-speed. All three leads showed 120 volts. I was reading the Intermatic manual for timer PE153F, and it said that two circuits would never be on at the same time.
I reconnected the common wire and high-speed wire, but I left the low-speed wire disconnected. After turning the power back on, I pressed the start button for high-speed, and it ran this time.
I guess circuit 2(low speed) of the timer is stuck "on" which causes problems when timer tries to go to high speed. Are there any tricks to try before I buy a new timer?