My Pentair 3/4 hp cleaner motor is malfunctioning. This problem started a couple weeks ago and I've been too busy to work on it until now. I just disabled the cleaner cycle since the pool is covered with a leaf net right now.
The motor hums and won't run, then within 15-20 seconds trips off. It doesn't trip a breaker, but I guess the internal thermal overload takes it out. After cooling off, it tries running again and the same results repeat. I can rotate the shaft by hand with no problem. I searched here for "motor hums" and found multiple posts concerning the capacitor. I pulled mine and tested it with a multi-tester, seems like it behaves as a "good" capacitor would. Without using a capacitance tester, I can't be certain - it just starts at low resistance and builds up as it collects charge. This tells me it isn't shorted. When I try spinning the shaft while the motor is humming, it will run for about 15 seconds, then trip just as it does when started from a dead stop.
I also tried rapping on the sides of the motor while it was humming to see if that helped. It didn't make any difference.
Is this a bad motor or is the capacitor just weak?
Thanks in advance - you guys are great assistance.