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HomeRepair HelpMars Central A/C RepairMars Central A/C Condenser fan motor does not run Repair
Mars Central Air Conditioner Condenser fan motor does not run
When your Mars central air conditioner's condenser fan motor does not run, the outdoor unit may stop removing heat, causing the system to shut down or blow warm air. The most likely cause is a failed run capacitor, especially if it is bulging or leaking. A defective capacitor can make the condenser fan noisy, overheat, or keep the outdoor AC fan from spinning. Next, check the motor control board, which helps regulate motor speed and can prevent the motor from running. If the board and capacitor are sound, the fan motor itself may have failed. A less common cause is the condenser fan motor or related motor component. Testing for incoming voltage can confirm the diagnosis, but central AC equipment contains dangerous 240-volt line voltage. Turn off power at the disconnect box and circuit breaker before inspection; live-voltage testing and electrical repairs are best handled by a qualified HVAC technician. No refrigerant work is needed for these parts, but any repair inside the sealed system requires EPA 608 certification. Enter your model number to find the exact Mars replacement run capacitor, capacitor, motor control board, or condenser fan motor for your unit.
01 - Mars 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 - Mars 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 - Mars 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 - Mars 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 - Mars 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 - Mars 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 condenser fan not running?
How do I troubleshoot an outdoor AC fan that is not spinning?
Can a bad capacitor make the AC fan motor stop running?
What else can cause an AC condenser fan motor not to work?
How do I find the correct Mars central air conditioner fan motor or capacitor?
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