Is Your Outdoor A/C Unit Making Odd Noises? What They Might Mean

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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.

If you hear banging, clicking, buzzing, hissing or other air conditioner noises, call a qualified technician for a professional diagnosis of your air conditioner. Calling now can save you money in the long run and may even prevent the need for costly repairs or the need to replace your air conditioner entirely.

Contact Apollo Home Heating, Cooling and Plumbing today for questions about air conditioner noises or other home comfort needs.  We’ve proudly served greater Cincinnati since 1910.

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