Homeowner stated that te unit wasn’t working,, that the thermostats were blank,,,found a blown fuse caused by a bad single pole contactor,, homeowner decided to replace it today, after replacing it we inspected the whole system, refrigerant pressures, capacitors, amp draw, temperature differential in cooling mode , found no more issues, system is working properly at this time. Recommended a duct cleaning ..( ductwork is very dirty )