A humming outdoor unit with a fan that will not turn is the call we get most in July in Norwalk, CT, and the cause is usually a failed run capacitor. That inexpensive component starts the compressor and fan, fades for years without complaint, and then quits under peak load. It is far from the only suspect, though. Contactors pit and stop passing clean power, condenser fan bearings dry out, small refrigerant leaks drain away cooling capacity, and evaporator coils ice over when a clogged filter strangles airflow.
When the heat goes out, see Furnace Repair.
Warning Signs for AC Repair
Spotting the early warning signs lets you act before the problem gets expensive. Keep an eye out for the following clues:
- Puddles near the air handler or water stains on the ceiling beneath it
- Hissing or bubbling sounds that suggest a refrigerant leak
- The system short-cycling every few minutes without cooling the house
- An iced-over evaporator coil or frozen refrigerant lines
- Breaker trips or a burning odor at startup
- The outdoor unit humming or clicking but the fan not spinning
- Higher summer bills even though the house still feels warm and humid
- Warm or room-temperature air blowing when the thermostat calls for cooling
Act Before It Gets Worse
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. At the first hint of a problem, call (475) 386-2400 for a fast inspection.
