LG Air Conditioner Not Turning On/Not Turning Off [How to Fix]

Is your LG air conditioner not turning on? There are several reasons this problem crops up and this article is a guide on how to fix the possible causes.

LG Air Conditioner Beeps But Does Not Turn On – Solved

If you find that your LG air conditioner does not turn on even though it beeps, there may be an insufficient power supply. Go to the circuit breaker that powers the unit and turn it off. Turn it on again but turn off other electrical appliances. If the air conditioner turns on and runs smoothly, it means it is not operating on its own circuit breaker.

Hire an electrician or a certified HVAC technician to check the power specifications of the air conditioning unit. The unit must connect to a breaker and outlet that provides the recommended amount of voltage to power the unit. Even if the breaker is supplying some power to light the display, it may not be enough to start and run the compressor.

In addition, you may want to check the operation mode of the unit. If it is on Energy Saver, it is likely the ambient temperature of the room is reached. When you turn the air conditioner on, it may beep and the display may illuminate, but the unit will not produce cool air. Select the Cool mode and reduce the ambient temperature. When it goes into the mode, it may begin to run. However, hire a technician to check the unit if the problem persists.

LG Air Conditioner Compressor Not Turning Off – Quick Fix

The following are possible reasons an LG air conditioner compressor keeps running and how to fix them:

1. Dirty Coils

The condenser coils in the outside unit can prevent the compressor from running smoothly if they are dirty. Clean the coils with a vacuum cleaner or wipe them with a damp rag if you can reach them.

The coils cannot dissipate heat generated by the operation of the refrigerant if they are dirty. The dirt acts as insulation or blanket, preventing the effective release of heat. So, the compressor has to work harder to keep the air conditioner running due to the heat.

2. Faulty Temperature Control Thermostat

Using a multimeter, run a continuity test on the thermostat that powers the air conditioner. Place the meter’s probes on the terminals of the thermostat. If the continuity from the meter is continuous, it is an indication that the component is shorted. Replace it because it can no longer work.

The thermostat supplies voltage to the fan and compressor to enable them to run. But if it is shorted, the compressor and fan will constantly run because the thermostat can send voltage without stopping.

3. Defective Thermistor

Test the thermistor with a multimeter to check its continuity. If it has no continuity, it cannot perform its duty. The best repair is to replace it. The thermistor is a sensor that is fixed to the air conditioner’s control board. Its job is to sense the temperature of the room and alert the control board. The board, in turn, sends power to the cooling unit to run. But if it becomes defective, it cannot sense the temperature and may lead to the compressor running non-stop.

4. Faulty Thermostat

Turn the air conditioner on and set it to Cool. next, take a multimeter to run a continuity test on the thermostat. It should show continuity while the unit is cooling. But if it has no continuity, replace the thermostat.

Bear in mind that the thermostat may control a heating element as well as the cooling function. So, it may have more than two terminals. Follow the instructions in the wiring diagram to check the thermostat if it applies.

5. Malfunctioning Relay Board

Check for signs of arcing or burns on the board, especially on the solder points. If there is a problem, you may have to consider replacing the board. However, be sure the board is bad before replacing it. If your testing skills are not strong, let a professional check the board because it is pretty easy to wrongly diagnose control boards. 

The board supplies power to several components of the air conditioning unit, including the motor of the fan and compressor. A fault with the board can work in two ways: it can either supply too much power, causing the compressor and fan to run non-stop, or providing too little.

You may also want to check the temperature control board and main control board. While they are not directly responsible for the compressor not turning off, they can still affect the air conditioner’s functionality. If you notice any damages on the boards, or there are burnt parts, replace the boards.

Check out these other articles…

How to Reset an LG Air Conditioner [Quick Guide]

LG Air Conditioner Modes [Guide, Issues & Solutions]

LG Air Conditioner Not Working [Problems Solved]

LG Air Conditioner Compressor [Problems & Proven Solutions]

How to Drain an LG Air Conditioner [Guide, Problems & Solutions]

LG Air Conditioner Cool vs Dry [Questions Answered]

How to Use an LG Portable Air Conditioner as a Dehumidifier [Detailed Guide]

LG Air Conditioner Not Turning On – What to Do

The problem may stem from the circuit breaker tripping or the dedicated wall outlet may be faulty. It may also be because the air conditioner needs servicing. First, ensure it is fully plugged into the wall outlet. A newer LG air conditioner model may have a GFCI on the power cord. If yours does, press the reset button and see if the unit comes on.

If that does not work, connect another appliance such as a table lamp to the wall outlet. The problem may not be with the unit but with the outlet. If the lamp comes on, you know the air conditioner needs servicing. But if not, check the breaker panel.

Go to the breaker that controls the air conditioner outside the house and see if it is tripped. While checking, inspect the disconnect box. Ensure there are no blown fuses and everything is correctly connected. It may be best to let a professional handle this part of troubleshooting and fixing.

Note: Duct-free and split units are business units and you need to contact LG Support if you have power issues with the air conditioner.

LG Air Conditioner Not Turning On with Remote – Quick Fix

Check the batteries of the remote control if you find your LG air conditioner is not turning when you use the remote. Typically, the batteries should be changed every year. So, if the batteries have been in use longer than a year, it is time to replace them.

If the batteries do not solve the problem, the remote itself may be damaged. There are replacements you can get from LG or search from authorized dealers.


If you have the problem of your LG air conditioner not turning on or turning off, follow the guide in this article to find and fix the problem. The solutions are pretty straightforward and inexpensive.

The problem may be the compressor wearing out or having internal damage if the unit keeps turning off. In such a case, it is best to replace the compressor unless it is more cost-effective to replace the unit.

However, keep an eye on different parts of the unit to detect faults. Regular maintenance also helps you catch faults before they become major problems. And if the troubleshooting and repair steps prove too difficult, contact LG for support and service or employ the services of an HVAC technician for further assistance.

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