Common Causes of Noisy Air Conditioner and Compressor
The noise from an air conditioning unit can have lots of causes depending on the type of unit. These noises should not be ignored and are
almost always a sign something that has gone wrong or is in the process of going wrong. The type of noise may be used to diagnose the nature of the problem. Ignoring it
allows the problem to worsen to the point where it cannot be fixed, or where fixing it will be very expensive. In some cases, an air conditioning unit is beyond repair by
the time it starts being noisy; however, much of the time the unit will need only minor work done in order to start functioning quietly again. In this post I will focus
on some of the more common noise sources in a window unit.
Cause 1 - Compressor
When 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.
Cause 2 - Fan Motor
The 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 fan motor.
Cause 3 - Fan Blade
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.
Cause 4 - Blower Wheel
Wiggle the blower wheel to see if it wobbles on the motor shaft. If the blower wheel is loose, try tightening or replacing the screw.
If blower wheel still isn’t stable, replace the blower wheel altogether.
Cause 5 - Blower Motor
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.
Hiring a Professional
When your air conditioner needs more than regular maintenance, hire a professional
aircon service technician. Our well-trained aircon technician will find and fix problems in your air conditioning system.