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Why is My AC Fan Not Working?

It's a terrible feeling to have your AC fan motor not working because you're so tantalizingly close to escaping the tyrannical heat of summer. You can hear the compressor working. You know there's cold air happening somewhere inside that box, but with the AC fan not spinning, the air has no way of getting out of the box to cool you off. Repair Clinic is here to help you get back to the comfortable conditions you had when everything was running smoothly. Our troubleshooting guide will assist you in figuring out why your AC fan is not turning on. Best of all, you'll save money on the replacement parts and you'll save even more money and time by doing the repair yourself.
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Common solutions for: Air conditioner fan not working
Solution 1:
Dual Shaft Fan Motor
The dual shaft fan motor (or circulation fan motor) might be defective. The circulation fan motor has two fan blades: one on either side of the motor. On one side, the fan blade draws in outside air o...ver the condensing coil to dissipate the heat. On the other side, the fan blade directs the air over the evaporator coil. The dual shaft fan motor has bearings that can loosen or bind over time. To determine if the motor bearings are defective, wiggle the motor shaft. If the motor shaft is loose, or if it won’t turn at all, replace the fan motor.
Required Part
Air Conditioner Dual Shaft Fan Motor
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Solution 2:
Fan Motor
Try turning the blade by hand. If the blade does not turn freely, this indicates that the motor bearings are worn out. If the motor bearings are worn out, replace the motor. If the blade turns freely,... test the incoming power to the fan motor. If power is getting to the fan motor, but the motor won’t run, this also indicates that the motor is defective and should be replaced.
Required Part
Air Conditioner Fan Motor
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Solution 3:
Relay Board
The relay board provides voltage to many components of the air conditioner, including the fan motor. If the relay board isn’t working properly, the fan might not run. Relay boards are often misdiagnos...ed; before replacing the board, make sure you check more commonly defective parts—particularly the fan motor capacitor and the fan motor itself. If you are certain that all of the other components are working properly, replace the relay board.
Required Part
Air Conditioner Relay Board
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Solution 4:
Main Control Board
The main control board provides voltage to all of the air conditioner’s components. If there is a problem with the control board, it might stop providing power to the fan motor. Control boards are oft...en misdiagnosed; make sure you check more commonly defective parts before replacing the main control board. If you are certain that all of the other components are working properly, replace the main control board.
Required Part
Air Conditioner Main Control Board
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Solution 5:
Temperature Control Thermostat
The temperature control thermostat has electrical contacts that burn out over time. If the electrical contacts are burned out, the thermostat won’t work properly The fan motor should always be running... when the compressor is on. If the compressor is running, but the fan motor is not running, the fan motor or the fan motor capacitor are likely at fault. If both the compressor and the fan motor won’t run, use a multimeter to test the temperature control thermostat for continuity. If the thermostat does not have continuity, replace it. (Note: Some thermostats may also control a heater and, as a result, will have three terminals. Refer to your air conditioner’s wiring diagram for more information.)
Required Part
Air Conditioner Temperature Control Thermostat
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Solution 6:
Thermostat
The thermostat monitors the temperature of the air. When the air temperature rises above a set point, the thermostat activates a switch to provide power to the fan and compressor. If the thermostat is... defective, it may prevent the fan from working. To determine if the thermostat is defective, set the air conditioner to cooling and then use a multimeter to test the thermostat for continuity. If the thermostat does not have continuity while the air conditioner is set to cooling, replace the thermostat. (Note: Some thermostats may also control a heater and, as a result, will have three terminals. Refer to your air conditioner’s wiring diagram for more information.)
Required Part
Air Conditioner Thermostat
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Solution 7:
Blower Motor
The blower motor may be burned out or worn out. First, check the fan blades. If the blades don’t spin freely, replace the blower motor. Second, make sure that power is getting to the blower motor. If ...the blower motor is getting power but the motor still won’t run, replace it. It is not possible to repair the blower motor; if it is defective, you must replace it.
Required Part
Air Conditioner Blower Motor
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Solution 8:
Thermistor
The thermistor is a sensor connected to the control board that detects the temperature of the air. If the thermistor is faulty, it may prevent the fan from running. To determine if the thermistor is a...t fault, use a multimeter to test it for continuity. If the thermistor does not have continuity, replace it.
Required Part
Air Conditioner Thermistor
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Solution 9:
Capacitor
The capacitor is attached to the compressor by electrical leads. If the capacitor burns out, the fan won’t run. To determine whether the capacitor is burned out, use a multimeter to test it for contin...uity. If the capacitor does not have continuity, replace it.
Required Part
Air Conditioner Capacitor
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Solution 10:
Rotary Switch
The rotary switch turns to activate the fan motor. Over time, the electrical contacts inside the switch can become pitted, preventing them from conducting electricity. To determine if the rotary switc...h is conducting electricity, use a multimeter to test the switch for continuity according to your air conditioner’s wiring diagram. If the rotary switch does not have continuity, replace it.
Required Part
Air Conditioner Rotary Switch
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Solution 11:
Selector Switch
The selector switch directs voltage to the fan. To determine if the selector switch is at fault, try making selections on the air conditioner’s control board. If the fan runs intermittently after you ...press a button, replace the selector switch. Additionally, if there is any arcing or smoke coming from the selector switch, replace it.
Required Part
Air Conditioner Selector Switch
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