Thermostat Went Blank and AC Quit in Fuquay-Varina
Fuquay-Varina · August 2026 · Mario · From our service records
What the customer reported
A Fuquay-Varina homeowner called after hours with no AC after the thermostat went blank. There was no power at the thermostat, and the outside unit was not turning on at all.
What we found and did
Mario found that the transformer at the attic air handler was bad, and the disconnect had warped and welded together due to arcing at the connections. He turned power off at the breaker, replaced the transformer, and tested system operations, which revealed a thumping sound from the ECM motor indicating motor failure. A disconnect replacement was scheduled for Monday to coincide with a previously scheduled cooling maintenance visit, and the office was set to call the supply house in the morning to confirm warranty coverage and motor availability.
Result
After Mario left, the homeowner reported that the replacement transformer had failed again, so it will need to be replaced once more with a low-voltage fuse added on the R wire.
