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HomeRepair HelpLennox Central A/C RepairLennox Central A/C Condenser fan motor does not run Repair
Lennox Central Air Conditioner Condenser fan motor does not run
When a Lennox central air conditioner's outdoor condenser fan motor is not running or spinning, the run capacitor is the most likely cause. A failed capacitor can make the condenser fan motor noisy, overheat, or stop completely; replace it if it is bulging or leaking. Next, check the motor control board, which regulates motor speed and can prevent the blower or fan motor from running. The fan motor, motor, and condenser fan motor are also common causes, especially when the motor receives proper voltage but will not start. A separate capacitor or the less-common condenser fan motor may be defective as well. This condenser fan troubleshooting requires caution: testing incoming voltage involves 240V line voltage, so disconnect power before inspection and have a qualified technician perform live electrical testing if you are not trained to do so. No refrigerant handling is needed for these checks, but any sealed-system repair requires an EPA 608-certified HVAC technician. Enter your Lennox model number to find the exact replacement run capacitor, motor control board, capacitor, or condenser fan motor for your specific central air conditioner.
01 - Lennox Central Air Conditioner Run Capacitor
If the run capacitor is defective, the fan motor might be noisy, overheat, or not run at all. To determine if the run capacitor has failed, inspect the capacitor. If the run capacitor is bulging or leaking, replace it.
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Common
02 - Lennox Central Air Conditioner Motor Control Board
The motor control board helps to maintain the desired motor speed of the blower. When the motor control board fails, the blower motor may not run at the correct speed or it may not run at all.
Common
03 - Lennox Central Air Conditioner Fan Motor
To determine if the fan motor is working, use a multimeter to test the incoming voltage to the motor. If the fan motor is receiving the correct voltage but the motor still won’t run, inspect the capacitor to ensure that it is not at fault. If the capacitor is not bulging or leaking, replace the fan motor.
Common
04 - Lennox Central Air Conditioner Motor
To determine if the condenser 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, inspect the capacitor to ensure that it is not at fault. If the capacitor is not bulging or leaking, replace the condenser fan motor.
Common
05 - Lennox Central Air Conditioner Capacitor
If the capacitor is defective, the fan motor might be noisy, overheat, or not run at all. To determine if the capacitor has failed, inspect the capacitor. If the capacitor is bulging or leaking, replace it.
Common
06 - Lennox Central Air Conditioner Condenser Fan Motor
To determine if the condenser 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, inspect the capacitor to ensure that it is not at fault. If the capacitor is not bulging or leaking, replace the condenser fan motor.
Less Common
Frequently Asked Questions
Why is my Lennox condenser fan not spinning?
How do I troubleshoot a Lennox AC fan motor that is not running?
Can a bad capacitor make the condenser fan motor noisy or overheat?
What should I check if my Lennox outdoor AC unit is not turning on?
How do I find the correct Lennox condenser fan motor or capacitor?
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