Responded to no cool situation. Resupply power to unit customer stated breaker would trip immediately found breaker would trip immediately for 4 attempts. Breaker stayed on for 5th attempt. Found short at disconnect box high voltage rubbed through to metal. Older unit owner believes it’s original to home roughly 2009. No data plate legible. Hb5a-e. Due to age and cannot order parts cust9mer chose option a. Retrieved parts and performed repair. 20 degree deltat. 68/48. No issues at this time