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HomeRepair HelpGrandAire Central A/C RepairGrandAire Central air conditioner is noisy or loud Repair
GrandAire Central air conditioner is noisy or loud
If your GrandAire central AC is making loud noise, start with the outdoor condensing unit and shut off power at the disconnect box before inspecting it. The most likely cause is debris hitting the condenser fan blade, so remove leaves, sticks, or other obstructions from inside the unit. If the air conditioner is making noise even after cleaning, the condenser fan motor may have worn bearings. With power off, rotate the motor by hand; it should turn smoothly without grinding or wobbling. Loose grille or cabinet panels can also vibrate and create an ac unit rattling noise, so check and tighten the fasteners. Next, inspect the condenser fan blade for damage, looseness, or a loose set screw. A failing condenser fan motor can produce AC fan motor noise or a noisy condenser fan as its bearings wear. Less commonly, a defective contactor may make buzzing or chattering sounds, and can prevent the unit from cooling. Contactor testing and all 240-volt line-voltage repairs should be handled by a qualified HVAC technician. Enter your GrandAire model number to find the exact replacement fan motor, fan blade, panel, or contactor for your central air conditioner.
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 - GrandAire 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 - GrandAire 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 - GrandAire 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 - GrandAire 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 GrandAire central AC making a loud noise?
How do I check a noisy condenser fan motor?
Why is my AC making a buzzing noise but not cooling?
How do I know whether the condenser fan blade or fan motor is causing the noise?
How can I find the correct GrandAire replacement part for my noisy AC?
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