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My AC Compressor's Not Turning On

An AC compressor not turning on can be a major problem because it narrows your choices: Sleep in a sweltering sweat box or go over to your in-laws. Whether it's a full-size unit or a window AC compressor not turning on, Repair Clinic can help you reach your optimal air temperature for comfortable habitation. We do that in several ways. First, we help you diagnose the problem with our troubleshooting guide and then we suggest the right part for the fix and have the part in stock, ready to ship. Finally, we save you a few bucks by showing you how to repair the compressor yourself. Don't kick off your summer struggling with an AC compressor that won't kick on. Repair Clinic will help keep the cool air flowing and your home pleasant.
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Common solutions for: Air conditioner compressor won't run
Solution 1:
Temperature Control Board
The temperature control board provides voltage to the fan motor and compressor. If the control board is defective, it may stop providing voltage to the compressor. Control boards are often misdiagnose...d. Before replacing the temperature control board, make sure you check more commonly defective parts—particularly the compressor overload, capacitor and the compressor itself. If you are certain that all of the other components are working properly, replace the temperature control board.
Required Part
Air Conditioner Temperature Control Board
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Solution 2:
Temperature Control Thermostat
The temperature control thermostat has electrical contacts inside that burn out over time. It is possible for the thermostat to still turn on the fan motor but not the compressor motor. ...
Required Part
Air Conditioner Temperature Control Thermostat
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Solution 3:
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 compressor from running. If you determine that the compressor is at fault, replace it.
Required Part
Air Conditioner Thermostat
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Solution 4:
Compressor
The compressor itself might be defective. However, this is not usually the case. Before replacing the compressor, be sure to check more commonly defective components—particularly the overload protecto...r and the compressor capacitor. If the compressor is defective, it should only be replaced by a licensed technician.
Required Part
Air Conditioner Compressor
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Solution 5:
Overload
The overload protects the compressor from burning out if it draws too much current. Over time, the overload can burn out. To determine if the overload is burned out, use a multimeter to test the overl...oad for continuity. If the overload does not have continuity, replace it.
Required Part
Air Conditioner Overload
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Solution 6:
Main Control Board
The main control board provides voltage to all of the components of the air conditioner. If there is a problem with the main control board, it might not send voltage to the compressor. However, this i...s rarely the case. Before replacing the board, make sure you check more commonly defective components—particularly the overload protector, compressor capacitor, and the compressor itself. 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 7:
Relay Board
The relay board provides voltage to many of the components of the air conditioner. If the board is defective, it can stop sending voltage to the compressor. Relay boards are often misdiagnosed; before... replacing the board, make sure you check more commonly defective parts—particularly the overload protector, the compressor capacitor, and the compressor 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 8:
Thermistor
The thermistor is a sensor connected to the control board that detects the temperature of the outside air. If the thermistor does not have continuity, it can prevent the compressor from running. To de...termine if the thermistor is at 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 compressor won’t run. To determine whether the capacitor is burned out, use a multimeter to test it for... continuity. If the capacitor does not have continuity, replace it.
Required Part
Air Conditioner Capacitor
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Solution 10:
Selector Switch
The selector switch directs voltage to the compressor. If the selector switch is defective, the compressor won’t run. First, check the capacitor, overload, and the compressor itself. If none of these ...parts are defective, the selector switch might be at fault. If the compressor runs intermittently when you press the selector buttons or rotate the switch knob, replace the selector switch.
Required Part
Air Conditioner Selector Switch
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