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HomeRepair HelpNutone Central A/C RepairNutone Central air conditioner is noisy or loud Repair
Nutone Central air conditioner is noisy or loud
When your NuTone central air conditioner is making loud noise, the outdoor condensing unit usually has a mechanical problem that can be identified with a careful inspection. The most likely cause is debris hitting the condenser fan blade, so shut off power at the disconnect box and circuit breaker before removing leaves or other objects. Next, check the condenser fan motor. Worn bearings can cause AC fan motor noise or a condenser fan making noise; with power off, rotate the motor by hand and replace it if it feels rough or does not turn smoothly. Loose grille panels or cabinet panels can also vibrate and create an air conditioner loud noise, so tighten them. If the fan blade is loose, damaged, or wobbles on the motor shaft, tighten its set screw or replace the blade. A failing condenser fan motor can produce the same symptom. Finally, a defective contactor may buzz or chatter and prevent the condensing unit from cooling. Enter your NuTone model number to find the exact replacement fan motor, condenser fan blade, or contactor for your unit. Cleaning and visual checks are reasonable DIY repairs, but contactor testing and other 240V work can be dangerous; have a qualified HVAC technician handle live-voltage diagnostics.
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 - Nutone 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 - Nutone 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 - Nutone 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 - Nutone 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 NuTone central air conditioner making a loud noise?
How can I tell if the condenser fan motor is making the noise?
Can a bad contactor cause my AC to make a buzzing noise?
What should I do if my noisy condenser fan is still loud after cleaning it?
How do I find the correct NuTone condenser fan motor or fan blade replacement part?
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