I just purchased a forclosure and discovered the upstairs A/C tripps the circuit breaker immediately when turned on. I thought it might be the run capacitor, but the guy at the store tested it and said it was ok. I'm hoping it's not the compressor, but it is looking that way. Is it still possible that the capacitor is bad? Any suggestions would be helpful. By the way I opened the circuit outside before the condensing unit and the breaker did stay in.