An outside unit that hums while the fan stays still is the call we get most in July in Chico, CA, 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
The sooner you notice these red flags, the easier and cheaper the fix. These are the signals our technicians see most often:
- Cooling bills climbing while the house stays sticky and warm
- A burning smell or repeated breaker trips when the AC starts
- Clicking or humming outside with no fan movement
- Rapid on-off cycling that never brings the temperature down
- Water dripping from the indoor unit or showing up on the ceiling below
- Vents blowing air that is barely cooler than the room
- Hissing or bubbling sounds that suggest a refrigerant leak
- Ice on the refrigerant lines or a frozen indoor coil
Don't Wait for a Total Failure
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. At the first hint of a problem, call (530) 201-3646 for a fast inspection.
