Why is my air conditioner making a loud buzzing sound?

Home / Air conditioning maintenance / Why is my air conditioner making a loud buzzing sound?
HVAC contractor in Livermore, California Best HVAC contractor in Livermore, California Top HVAC contractor Air conditioning contractor Livermore Heating contractor Livermore Residential HVAC contractor Commercial HVAC contractor

Why is my air conditioner making a loud buzzing sound?

When your air conditioner is working properly and efficiently, it should not produce any sound louder than a low hum. If you hear a strange, distracting buzz from your AC unit, that’s usually an indication that something is wrong.

There are several issues that can lead to a buzzing sound from your AC unit. While some are simple, others may be quite serious, requiring an immediate call for professional air conditioning repair services.

Check out these 5 common reasons why your AC is making a loud buzzing sound:

1. Condenser fan motor issue

When your AC unit is turned on, the condenser fan blows air from the outside unit. If the fan blades are not turning but the inside blower is working fine, the compressor motor may emit a loud buzzing noise. Loose parts, a malfunctioning fan, or debris inside the unit can all prevent the blade from turning. In this case, we suggest calling an HVAC professional to trace down the problem.

2. Loose ac parts

Your AC system is made up of many moving parts and occasionally, the components can vibrate so much that they come loose. Even tiny parts can sometimes affect the performance and efficiency of your AC, and can also lead to more expensive issues over time. Are you wondering how long you might have before this becomes a complete AC breakdown? A reputable HVAC technician can identify and correct the issue.

3. Frozen ac unit

An air conditioner that runs continuously for long periods of time can freeze up, creating a loud buzzing noise. If this happens with your unit, turn off the AC immediately and allow the unit time to thaw. Try again after a few hours of thaw time. Refrigerant leaks may also lead to frozen coils. If this happens again, don’t delay scheduling air conditioning repair services immediately.

4. Damage to the isolation foot

The AC compressor is almost always mounted on the base of the AC unit. It sits on a small rubber foot, also called isolation foot. Over time, the rubber on the isolation foot can crack or deteriorate. This results in the compressor being unbalanced–producing a buzzing noise when operating.

5. Compressor malfunction

Your air conditioning unit’s compressor works to pressurize and cool the refrigerant. A buzzing sound may indicate that the compressor is not working properly, or that there’s an electrical problem. Contact a reputable HVAC contractor for professional air conditioning repair services to have your system properly diagnosed and fixed.

Air conditioning contractor, Heating contractor

For any kind of HVAC installation, repair, and maintenance requirement contact our experts by email at info@superiormsi.com or call (925) 456-3200

Skip to content