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HomeRepair HelpCentral A/C RepairCentral air conditioner is noisy or loud Repair
Central air conditioner is noisy or loud
If your central air conditioner is making loud noise, start at the outdoor condensing unit, where debris, worn bearings, loose panels, or a damaged condenser fan blade are the most likely causes. Shut off power at the disconnect box and circuit breaker before inspecting or cleaning the unit. Clear leaves and other debris from the condenser fan and grille, then check for loose panels that may vibrate while the air conditioner runs. If the condenser fan motor does not turn smoothly by hand, its bearings may be worn and the motor may need replacement. A loose set screw or damaged fan blade can also cause a noisy condenser fan or AC fan motor noise. Less commonly, a defective contactor can make buzzing noise and may leave the condensing unit noisy without cooling. Testing or replacing a contactor involves 240V line voltage and should be handled by a qualified technician unless you are trained and equipped to work safely. Enter your central air conditioner's model number to find the exact replacement fan motor, condenser fan blade, or contactor for your unit. No refrigerant work is needed for these checks, but any sealed-system repair requires an EPA 608-certified HVAC technician.
01 - Debris Hitting Fan
Over time debris can fall into the condensing unit, causing a noise when the fan is running. Inspect the fan blade and inside the unit for any debris. Clean out the outdoor unit as needed but be sure to shut off power to the unit before attempting to clean it out.
Top Solution
02 - Central Air Conditioner Fan Motor
The fan motor has bearings that can wear out over time. When the bearings are worn out, they make loud noise. To check the bearings, try rotating the fan motor by hand. If the motor does not turn smoothly, replace it.
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Highly Likely
03 - Panels Vibrating
If the outdoor condensing unit is noisy, the grille or one of the panels may be loose and vibrating. Check for loose panels and tighten them as needed.
Highly Likely
04 - Central Air Conditioner Fan Blade
The fan blade on the condenser fan motor might be defective or loose. To check the fan blade, wiggle the fan motor shaft. If the motor shaft is loose, tighten or replace the set screw. If the condenser fan motor is still making noise, replace the fan blade.
Less Common
05 - Central Air Conditioner Condenser Fan Motor
The condenser fan motor has bearings that can wear out over time. When the bearings are worn out, they make loud noise. To check the bearings, try rotating the condenser fan motor by hand. If the motor does not turn smoothly, replace it.
Less Common
06 - Central Air Conditioner Contactor
The furnace control board sends a low voltage signal to the contactor. When the contactor receives the signal from the control board, it closes the circuit, sending voltage to the condensing unit components. If the contactor is defective, it will not provide voltage to the condensing unit. In addition, the contactor will make noise when it is defective. If the condensing unit is making noise but not cooling, the contactor has probably failed. To determine if the contactor is at fault, use a multimeter to test the contactor for continuity. If the contactor does not have continuity, replace it.
Less Common
Frequently Asked Questions
Why is my central AC making a loud noise?
How do I troubleshoot a condenser fan making noise?
What causes an AC unit to make a buzzing or rattling noise?
Can a noisy condenser fan motor cause my air conditioner to stop cooling?
How do I find the correct replacement part for a noisy central air conditioner?
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