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HomeRepair HelpHeil Central A/C RepairHeil Central air conditioner is noisy or loud Repair
Heil Central air conditioner is noisy or loud
If your Heil central air conditioner is making loud noise, start with the outdoor condensing unit and shut off power at the disconnect box or circuit breaker before inspecting it. The most likely cause is debris hitting the condenser fan blade, followed by worn bearings in the condenser fan motor, loose panels or grille vibrating, a loose or defective fan blade, and then a failing condenser fan motor. These problems can cause central AC making loud noise, air conditioner making noise, condenser fan making noise, or noticeable AC fan motor noise. Clear debris, check for loose panels, and gently rotate the fan motor by hand to see whether it turns smoothly. If the noise sounds like buzzing and the unit is not cooling, a defective contactor may be failing to send power to the condensing unit. Testing or replacing the contactor, condenser fan motor, or other 240-volt components is beyond basic DIY work and should be handled by a qualified HVAC technician. Enter your Heil model number to find the exact replacement fan blade, condenser fan motor, 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 - Heil 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 - Heil 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 - Heil 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 - Heil 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 Heil central air conditioner making a loud noise?
What should I check if the condenser fan motor is making noise?
Can a defective contactor cause an air conditioner to make a buzzing noise?
How do I know whether the noisy condenser fan needs a new fan blade or fan motor?
How can I find the correct Heil central air conditioner replacement part?
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