LG Air Conditioner Fan [Problems & Solutions]

The fan in an air conditioner keeps the unit from overheating. But if your LG air conditioner fan is faulty, this article helps you solve the problem.

LG air conditioner fan

LG Air Conditioner Not Working – How to Fix

If you find that the fan in your LG air conditioner is not working, check the following and fix the faulty ones:

1. Fan Motor

Locate the air conditioner fan and turn the blades with your hand. If they appear stiff, it may be because the motor bearings are worn. And if the bearings are worn, the motor cannot work. Since the bearings cannot be repaired, replace the motor.

However, if the blades turn well, check to see if the motor is receiving electric power. Use a multimeter to run the test. If it is receiving power yet the motor will not run, the motor is faulty and needs a replacement.

The motor is what enables the fan to run. Without the motor, the fan cannot work, and the air conditioner runs the risk of completely shutting down.

You can also check the motor of the dual shaft fan, which is the circulation fan in the indoor unit. The fan typically has two blades on either side of the motor. But the motor bearings may not be working any longer. Therefore, turn the shaft to see if it is loose. If the shaft wiggles loosely or is stiff, the motor needs a replacement.

2. Thermostat

There are two thermostats to check. One is the temperature control thermostat and the other is the internal thermostat. Both have the same testing methods but different functions. For both, use a multimeter to run a continuity test.

For the internal thermostat, ensure you set the air conditioner to cool before testing it. Place the probes of the multimeter on the terminals of the thermostat and check if there is continuity. Replace the thermostat if there is no continuity.

And for the temperature control thermostat, check to see if the outside fan and compressor are running. If they are, run a continuity test on the thermostat and replace it if you find no continuity.

Both thermostats may control a heater if the air conditioner is the Cooling and Heating model. In such a case, the thermostats may have three terminals, so consult the unit’s wiring diagram for further assistance.

The thermostat keeps an eye on the air temperature and activates the selector switch to provide electric power to the fan and compressor when the temperature warms beyond a preset point. If the thermostat stops working, the fan will not run, and the compressor may run in short bursts.

The temperature control thermostat may have burnt out electrical contacts. If that is the case, the compressor and fan will not work. As long as the compressor is running, the fan must also run, so you know the thermostat is bad if the fan and compressor stop working.

3. Capacitor

Check the capacitor that powers the fan. If it is leaking or bulging, it is time to replace it. But if it shows no sign of damage, check to see if it has continuity using a multimeter. Replace the capacitor if it registers no continuity on the multimeter.

4. Thermistor

Use the air conditioner’s specification sheet to determine what the correct resistance of the thermistor is. Next, get a multimeter and check the thermistor’s resistance. If it does not correspond with the value on the specification sheet, get a replacement thermistor.

It is a sensor that reads the air temperature and sends readings to the control board. That way, the board activates the cooling system. If the thermistor fails, the fan and compressor may not run when they should.

5. Boards

The main control and relay boards may be faulty. Each provides voltage to different components within the air conditioner. So, the fan will not work if either or both become faulty. However, check other components first before checking the boards because they hardly fail and they are easy to misdiagnose. When other components are working well yet the problem continues, replace either or both boards.

6. Rotary Switch

The switch that turns to send power to the fan motor and compressor may be defective. With constant use, its internal electrical contacts may get pitted and fail to conduct electricity. Run a test on it to check its continuity using a multimeter. Replace the switch if there is no continuity.

Note: These steps apply to the fans in all types of LG air conditioners, including the portable and split units.

LG Air Conditioner Fan Making Noise – Solved

If you hear noise coming from the fan area in your LG air conditioner, first, ensure the noise is coming from the fan. Sometimes, other components may become noisy but their closeness to the fan makes it seem as if the fan is the source.

Check the compressor if the noise is from the outside condensing unit. While it is easier for the fan to make noise, the compressor can also become noisy, especially if it has a fault. However, it is not always necessary to replace a noisy compressor; the noise does not always mean it is defective. You can continue using it if you are sure it will not affect other parts.

But if the fan is creating noise, check the following:

1. Motor

When the bearings of the motor become tired, they cause the motor to become noisy. The same is true if the shaft is loose. But ensure the blades are not making noise. They may be loose and hitting the sides of the housing for the fan. If they are not and the fan still makes a noise, check the motor bearings. Replace the motor if the bearings are worn because you cannot fix the bearings.

2. Blades

If the blades are loose on the motor shaft, they will rub against the housing and generate noise. Check the blades to ensure they are sitting tight on the shaft. If they are loose or damaged, it may be time to replace them.

3. Blower Wheel

The blower wheel, like the blades, may sit loosely on the motor. See if you can tighten the screw or change it. If that does not fix the blower wheel, replace it. Also, check the motor of the blower. It may have worn bearings. Replace the motor if it has worn bearings.

If nothing else seems to fix the fan noise, it is crucial to replace the fan to keep the air conditioner up and running. Otherwise, the noise may stop the fan over time because of a faulty part, and eventually affect the compressor.

Check out these other articles…

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LG Air Conditioner Fan Speed Problem – Quick Fix

If you have trouble changing the fan speed in your LG air conditioner, check the fan belt, motor, and run capacitor. When the fan belt slacks due to normal use, the fan will have a hard time running. You will also find that you cannot change the fan speed even if the fan is running. Replace the belt if it has slacked.

Next, check the capacitor. If the fan belt has not slacked but the fan speed has a problem, the run capacitor may be the problem. Test the capacitor and if it is not functional, replace it to fix the fan speed problem.

The next step is the motor of the fan. When every other part is in good working condition, you may have to replace the motor. There may be a wiring problem or a loose connection, and the fan speed, among other things, will not work if that is the case.

Keep Your Fan Up and Running

It is important to know that using the wrong fan speed can wear the fan out before its time. Ensure you keep the fan setting on the thermostat at Auto, not On, when using the air conditioner. 

Typically, the fan runs continuously without stopping when you set it at On, causing it to wear out. But it runs with the set temperature when you set it to Auto and uses the thermostat’s set temperature. That way, the fan lasts long without having problems such as the inability to change the fan speed.

LG Air Conditioner Fan Mode – How to Use

When using your LG air conditioner in the Fan operation mode, the compressor does not run. To activate the mode, ensure the air conditioner is running. Next, find the Mode button on the control panel or remote control and press it until you select Fan. Then, select the fan speed by pressing the Fan Speed button.

To turn the Fan mode of operation off, press the Mode button to move the air conditioner to another mode. Remember to adjust the temperature and set the fan speed if you choose the Cool operation mode.

LG Air Conditioner Fan Speed F1 – What It Means

When you see F1 to F3 on the display of an LG air conditioner, it is showing the wind speed as it currently stands. F1 is the lowest wind speed, F2 is medium wind speed, and F3 is the highest wind speed. It does not indicate a fault with the air conditioner. But if you are in doubt, contact LG Support Center for further assistance.


Monitor the functionality of your LG air conditioner fan because of the role it plays in how the unit functions. If the fan does not run, whether it is the blower or condenser fan, the air conditioner will have a hard time producing cool air. Both fans are part of the cooling system.

Run service checks on the air conditioner from time to time to ensure it is in good working condition. You will notice faults with the fan and other components that way. LG can service the unit, especially if you have an active warranty. Otherwise, contact a qualified service technician for the job.

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