An outside unit that hums while the fan stays still is the call we get most in July in Arcadia, 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.
For winter breakdowns, see Furnace Repair.
Warning Signs for AC Repair
Spotting the early warning signs lets you act before the problem gets expensive. These are the signals our technicians see most often:
- An iced-over evaporator coil or frozen refrigerant lines
- Bubbling or hissing noises that point to a possible refrigerant leak
- A condenser fan that sits still while the outdoor unit hums
- Puddles near the air handler or water stains on the ceiling beneath it
- Vents blowing air that is barely cooler than the room
- Cooling bills climbing while the house stays sticky and warm
- The system short-cycling every few minutes without cooling the house
- A hot electrical smell or a tripped breaker whenever the air conditioner kicks on
Don't Wait for a Total Failure
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. If you notice any of these signs, call (626) 231-7816 for a prompt inspection.
