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HomeRepair HelpBosch A/C RepairBosch Air conditioner is loud or noisy Repair
Bosch Air conditioner is loud or noisy
If your Bosch air conditioner is loud or noisy, start by matching the sound to the parts most likely to cause it. A worn compressor can make an air conditioner making noise sound worse than normal, although many noisy compressors keep running for years and should be replaced only by a licensed professional. More often, an AC making loud noise comes from the dual shaft fan motor as its bearings wear out. Next, check the front and rear fan blade for cracks, bending, or rubbing against the fan housing, especially if the air conditioner is rattling. A failing condenser fan motor can also get noisy, and if it receives proper voltage but will not run correctly, the capacitor and motor should be tested. The fan motor bearings are another common source of grinding or scraping sounds. If the blower wheel wobbles on the motor shaft, tighten the set screw or replace the blower wheel. Enter your Bosch air conditioner model number on RepairClinic.com to find the exact replacement part that fits your unit.
01 - Bosch Air Conditioner 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.
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02 - Bosch Air Conditioner Dual Shaft Fan Motor
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.
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03 - Bosch Air Conditioner 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.
Highly Likely
04 - Bosch Air Conditioner Condenser Fan Motor
To determine if the condenser fan motor is working, use a multimeter to test the incoming voltage to the motor. If the condenser fan motor is receiving the correct voltage, but the motor still won’t run, you should inspect the capacitor, if applicable, for any bulging or leaking. You can also use a multimeter to determine if the capacitor can hold and release its charge. If the capacitor appears to be in good condition, replace the condenser fan motor.
Highly Likely
05 - Bosch Air Conditioner Fan Motor
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.
Highly Likely
06 - Bosch Air Conditioner 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 set screw screw if it has one. If blower wheel still isn’t stable, replace the blower wheel altogether.
Common
Frequently Asked Questions
Why is my Bosch air conditioner making a loud noise?
What causes a Bosch window air conditioner noisy rattling sound?
Should I replace the compressor if my Bosch AC is making loud noise?
Can a bad condenser fan motor make my Bosch air conditioner grind or hum?
How do I find the right Bosch air conditioner fan motor, fan blade, or blower wheel?
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