Problem started when the timer (Intermatic T104) would not shut off the pump. The manual switch would shut off the other components (IntelliChlor Cell) but the motor kept running. I had to kill the main switch to cut power to the pump. I replaced the timer twice with the same model - both times the timer would work as expected but then after about 1 week, same issue - timer would not shut off the pump (both timer and manual switch did not work). Using the manual switch the other components would power off, motor kept on running.
I don't believe it's the wiriing as I labeled the original configuration and took a picture...and it worked great the first week after changing out the timer. I doubt the timer was faulty twice, so thinking i have a short in the motor?
The system is about 9yrs old, I replaced the motor about 2 years ago...I got better mileage out of the original motor so not sure if I need to replace it or check something else.