Buzzing Noises in AC Units



Why is My AC unit making a Loud Buzzing Noise?

Nobody wants buzzing noises in AC units. The smoother and quieter the appliance is, the better for everyone. Unfortunately, your AC unit is not immune to mechanical issues. It will, every now and then, develop problems that require fixing. These issues are usually indicated through things like buzzing noises. 

Loud buzzing noises in AC Units are usually an indication of a problem that will require money to fix. Not to mention that problems cause inconveniences. What then, could be the problem when your usually quiet AC unit starts to buzz?

Our residential AC company shares what could be wrong with your AC unit if you hear a buzzing noise. 

Faulty Compressor 

The compressor pressurizes and cools the refrigerant within the AC system. It is located in the outdoor unit and is integral in the circulation of the refrigerant throughout the entire system. A buzzing sound could mean that the compressor is not working properly or that there is a power problem on the outdoor unit. 

Frozen AC unit

Your AC unit will freeze if the refrigerant leaks from the system. McQuillan Bros, Twin Cities HVAC Contractors, urges customers to remember that the refrigerant used in the system is extremely cold. Leaks can happen due to a number of reasons. When they do, you are likely to hear a buzzing sound. 

Loose Parts 

Loose parts are normally accompanied by a buzzing and rattling sound. Your AC unit is likely to encounter a loose-parts problem as it ages. After all, it is not uncommon for your AC unit to vibrate when working. Loose parts such as bearings can lead to additional or premature wear throughout the system, which can, in turn, lead to buzzing sounds.

Missing or Damaged Isolation Feet 

Isolation feet are used to mount the compressor. The isolation feet are small and usually made of rubber to keep the compressor off the floor and keep it properly balanced. Continued use of the AC unit can lead to cracking or disintegration of the isolation feet, which interferes with the balance of the compressor. When this happens, you are likely to hear a buzzing or loud vibration whenever the AC unit is working. Luckily these can easily be fixed during your next Placerville HVAC service.

Electrical issues 

An electrical issue can also cause a buzzing noise within the AC unit. Sadly, there are many electrical issues that may result in this kind of noise. For example, the unit might undergo ‘electrical arcing.’ This happens when an electrical current misses its intended path and takes on other parts of the circuit. 

Other electrical issues that could lead to a buzzing noise within the AC include:

  • Loose wiring
  • A bad capacitor 
  • A faulty condenser fan motor 
  • Contractor relay switch on the outdoor unit

Dealing with a Buzzing Noise 

No one wants a buzzing AC unit in their home. Your AC system is complex, and it requires a combination of parts working together to provide you with the right conditions for your comfort. Therefore, the best way to deal with a buzzing noise is to switch off the unit and call a trained professional. 

Gilmore Heating, Air, and Plumbing have been serving the Sacramento, Placerville, and surrounding areas since 1973. If your AC system is making a loud buzzing noise, contact Gilmore Heating and Air. Our HVAC techs will thoroughly assess your AC unit and recommend the right course of action. Whether that be residential AC repair or AC maintenance help, you need to keep your AC unit in its best shape.