An outside unit that hums while the fan stays still is the call we get most in July in Hillsboro, OR, 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
The sooner you notice these red flags, the easier and cheaper the fix. Watch for these telltale signs:
- Warm or room-temperature air blowing when the thermostat calls for cooling
- The system short-cycling every few minutes without cooling the house
- An iced-over evaporator coil or frozen refrigerant lines
- Puddles near the air handler or water stains on the ceiling beneath it
- A burning smell or repeated breaker trips when the AC starts
- Bubbling or hissing noises that point to a possible refrigerant leak
- A condenser fan that sits still while the outdoor unit hums
- Cooling bills climbing while the house stays sticky and warm
Early Action Saves Money
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Don't wait, call (971) 535-9448 and we'll take a look right away.
