I have a 4HP swim jest pump that does not seem to start-up. When I turn it on, it makes a loud buzzing sound, and after about 30 seconds it trips the breaker. It sounds like the pump is trying to start but stuck/jammed. It's only about 5 years old, and it started "sticking" about a couple years ago, but I was usually able to get it going on the 2-3 turn on. Any thoughts on what it is or how I can troubleshoot the problem? I vaguely remember reading about the solenoid as a potential problem... It's a Speck/Centurion/AO Smith 4HP model: 21-80/33GS. See pics attached (don't know why they posted upside down)