If your air conditioner is humming, it could be a sign of an electrical or mechanical problem. Take steps now to determine the issue with your air conditioner.
Possible causes of your cooling system’s hum could include:
- The condenser fan motor on the unit could be unable to spin but still have power reaching it, creating resistance that produces a pronounced, and often loud, humming sound.
- There could be a mechanical or electrical breakdown with the contractor relay switch, which is responsible for starting the outside unit when the indoor temperature rises to the level where cooling is required. When the contractor fails, it can create a humming sound.