Well I got a doozy here, have a 2000 sq ft walk-in freezer with 3 systems, one of the systems is popping the 15 amp control fuse on the strip, it was popping every hr or 2 before, I washed out the plugged condenser thinking maybe the condenser circuit was heating up. This stopped the blowing of the fuse every hr to every day, I installed a resettable 15 amp breaker in place of it, and now seems to blow every 4-5 days, no wires are loose or corroded, the control contactor was replaced thinking I had a bad coil. I tried everything I could think of, took it in and out of defrost while having my amp meter on the circuit and never drew above .20, somehow it is popping, system is cooling well. I am attaching the wiring diagram. The defrost clock is new as well, the fuse that blows is F-3, what do you think!