I was working on a yorkrooftop unit last week and the breaker in the disconnect (100amp 3 phase commander breaker) was no good, i had proper voltage at line side and missing 1 leg of 3 phase on load side, the unit ran for a week and now today i went back and had the same problem, is there somthing in the unit that would take out this breaker??? overamperage? improper voltages? any suggestions?