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HomeRepair HelpLG A/C RepairLG Air conditioner compressor won't run Repair
LG Air conditioner compressor won't run
If your LG air conditioner compressor won’t run, the fan may still blow while the unit never gets cold because the compressor is not starting. The most likely cause is a failed temperature control thermostat with burned internal contacts, followed by a defective temperature control board that is no longer sending voltage to the compressor. A faulty thermostat can also keep power from reaching the fan and compressor circuit. Next, check the compressor overload, which protects the compressor from excessive current and can be tested for continuity with a multimeter. The compressor itself can fail, but it is less common and should be confirmed only after checking the overload protector and compressor capacitor. A bad thermistor can also cause an AC compressor not turning on if it cannot properly report temperature to the control board. Whether the issue is an air conditioner compressor not working, a compressor not starting, or an LG AC that runs the fan only, enter your model number on RepairClinic.com to find the exact replacement part for your specific air conditioner.
01 - LG Air Conditioner 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.
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Highly Likely
02 - LG Air Conditioner 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 misdiagnosed. 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.
Highly Likely
03 - LG Air Conditioner 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.
Highly Likely
04 - LG Air Conditioner 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 overload for continuity. If the overload does not have continuity, replace it.
Highly Likely
05 - LG Air Conditioner 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 protector and the compressor capacitor. If the compressor is defective, it should only be replaced by a licensed technician.
Highly Likely
06 - LG Air Conditioner 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 determine if the thermistor is at fault, use a multimeter to test it for continuity. If the thermistor does not have continuity, replace it.
Common
Frequently Asked Questions
Why won't my LG air conditioner compressor turn on even though the fan runs?
Can a bad thermostat cause my LG AC compressor not to start?
How do I test the overload on an LG air conditioner compressor?
Should I replace the control board if my LG air conditioner compressor is not working?
How do I find the right LG air conditioner part for a compressor that won't run?
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