No cool on upstairs system. Found system not operating at all. Inspected breaker panel and safety switches and everything was in order. My diagnostic found a blown fuse in the air handler. I checked both contactors and low voltage wiring. I found one short on the high pressure switch wiring inside outdoor unit. I secured with zip ties and repaired with electrical tape. Checked refrigerant levels and amps. System ran for an hour with no issues. Recommend having outdoor unit cleaned. Unit for main floor is very noisy at startup. Notified customer.