Is Your Outdoor A/C Unit Making Odd Noises? What They Might Mean
Noises coming from your outdoor A/C unit could mean a simple service call for an adjustment or it could also mean it’s time to replace the compressor. Here are some common air conditioner noises and what they might mean:
- Banging or clanging – Bangs and clangs are usually caused by loose internal mount parts.
- Bubbling or hissing – These noises usually indicate a refrigerant leak, which can be repaired by a licensed HVAC professional.
- Buzzing – Buzzing could mean the fan motor is bad. Check the contactor relay switch at the fan for burning or arcing and check for loose wiring.
- Clanking – Clanking means the motor mounts inside the sealed unit have failed. The compressor may need to be replaced.
- Clicking and ticking – These sounds could be due to loose hardware like springs or shipping bolts.
- Clicking – This is usually a bad relay switching on and off.
- Humming – Humming may be a seized motor that needs to be replaced. Turn off the unit and call a qualified technician.
- Squeal – A squeal is normal on start-up if it’s brief and has always been present.