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The outside air conditioner condenser unit is “the heart” of your air conditioner. Some noises are associated with the normal use of the condensing unit. Other noises could be a valid reason to be concerned. Here are some of the more common noises and what they might mean:

  • Vibrating – Perhaps leaves or other debris are trapped in the unit. Or this could be due to improper installation: loose screws or bolts left over from transporting the air conditioner unit. Vibration could also mean one part is coming into contact with another part or the housing during use. You can clear leaves or debris from the outside condensing unit yourself. The other problems are more serious and will need a qualified technician to correctly diagnose and repair.
  • Banging – Could be a loose internal part like a piston pin, crankshaft or a connecting rod. Most compressors nowadays are in sealed units so it may be necessary to replace the whole unit.
  • Screaming – Could be due to excessive internal pressures. The unit should be turned off immediately, then call a professional.
  • Hissing – Probably is associated with leaking refrigerant and a service call is in order.
  • Clicking – Noises coming from the air conditioner condenser could mean faulty relay switches. The clicking is from the relays turning on and off.
  • Rattling – Could mean the motor mounts are broken and the motor is thrashing around inside the sealed unit. Unfortunately, this likely means you will need a new air conditioner.

Contact us at NisAir Air Conditioning & Heating for more help with air conditioner condenser noises and any other home comfort concerns. We’ve been serving homeowners in Martin, Palm Beach, St. Lucie and Indian River counties since 1973.

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