The part(s) or condition(s) listed below for the symptom Air conditioner is loud or noisy are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
Air Conditioner Won't Turn Off? Air Conditioner Troubleshooting
Air Conditioner Remote Not Working? Air Conditioner Troubleshooting
Air Conditioner Loud or Noisy? Air Conditioner Troubleshooting
Air Conditioner Fan Not Working? Air Conditioner Troubleshooting
Air Conditioner Compressor Won't Run? Air Conditioner Troubleshooting
Air Conditioner Not Cooling? Air Conditioner TroubleshootingWhen the compressor is wearing out, it generates more noise than usual. When this happens, it is not necessary to replace the compressor—compressors often last for years after they become noisy. However, if you would prefer to have a new compressor, have a licensed professional replace it.
The fan motor or dual shaft fan motor has bearings which are usually permanently lubricated. However, over several years, the lubrication will break down, causing the motor to become noisy. If this happens, replace the dual shaft fan motor.
Air conditioners have a fan blade in the front and a fan blade in the rear. Check both fan blades for damage. If a fan blade is damaged, or is rubbing against the fan housing, replace it.
The fan blades might be scraping against the blower housing. Air conditioners have a fan blade in the front and a fan blade in the rear. Check both fan blades to ensure that they are not rubbing against the housing. If the blades aren’t rubbing against the housing and the fan motor is still noisy, check the fan motor bearings for wear. If the bearings are worn, replace the fan motor.
Wiggle the blower wheel to see if it wobbles on the motor shaft. If the blower wheel is loose, try tightening or replacing the set screw screw if it has one. If blower wheel still isn’t stable, replace the blower wheel altogether.
Motor
Brace
One or more of the fan blades might be scraping against the housing. Air conditioners have a fan blade in the front and a fan blade in the rear. Check both fan blades to ensure that they are not rubbing against the housing. If the blades aren’t rubbing against the housing and the fan motor is still noisy, check the blower motor bearings for wear. If the bearings are worn, replace the blower motor.
An air conditioner blower wheel bearing supports the wheel as it spins to circulate the air. If the bearing is worn out, the blower wheel may vibrate and make noise as it rotates. Some blower wheel bearings can be replaced independently of the blower wheel.
