How to Troubleshoot an LG Air Conditioner Problem?

lg troubleshooting air conditioners

Have you ever experienced a problem with your LG air conditioner? If so, you probably don’t know where to start LG troubleshooting air conditioners. This guide will walk you through the steps necessary to fix your LG AC system.

Troubleshooting an LG Air Conditioner

It is not as difficult as it may sound. The following tips should help you get started for LG air conditioner troubleshooting:

1. Unit Not Cooling

Follow these steps to adjust the control panel if the unit is not cooling or the LG air conditioner control panel not working:

Unit Not Cooling

Step 1: Set to Cool

First, turn the unit on and set it to cool. Then, set the unit’s temperature to the lowest setting at 60 degrees Fahrenheit. 

Most of the LG Ac have a fan speed option. Adjust this accordingly to see how much more effective it is.

Step 2: Adjust Fan Speed

Next, adjust the fan speed to the maximum setting. You should notice a difference after changing the fan speed.

Step 3: Check for Cold Air

Now, check whether the cold air is flowing from the vents. If it is, the problem is likely due to a low refrigerant. It needs to recharge by professionals.

Check for Cold Air

2. Unit Improperly Installed

The installation process of the unit must be done correctly. First, ensure the unit is installed according to the manufacturer’s instructions.

  • If the unit is overloaded, it won’t work efficiently. Try to reduce the load by unplugging any appliances that use electricity.
  • A faulty compressor can cause many issues. 
  • A low level of refrigerant causes the unit to overheat. 
  • Damaged coils can result in overheating. In such cases, you need to replace the coil.
  • Broken parts can cause problems like noisy operation, excessive noise, and reduced performance. Repair damaged parts immediately.

Here are some steps to resolve improperly installed LG ac:

Step 1: Check for Adequate Airflow

Make sure the unit has adequate airflow. If it doesn’t, you must install it without obstructions. Proper clearance from both sides and the rear is essential. Obstructions can impede airflow. Install the unit correctly. Reinstall it if it wasn’t.

Step 2: Remove Interior Obstructions

Remove all interior obstructions such as furniture away from the unit as it will affect the unit’s efficiency.

Step 3: Check for Outside Obstructions

Check for outside obstructions. They include trees, bushes, fences, walls, etc. These obstructions can cause problems with the unit. So, remove them.

Always keep at least 20 inches gap between the external exhaust and any external obstruction. It ensures good airflow.

3. Unit Leaking Water

You should always check the angle at which the air conditioner is installed when installing a wall unit or window unit. The unit must tilt toward the outside by at least a quarter-inch to a half-inch for condensation from the base pan to drain out to the outside.

If water leaks into the unit, you must clean up the area around the unit. You also check for rusting pipes. You need to inspect your ac system regularly.

Unit Doesn't Blow

4. Unit Doesn’t Blow

If the unit isn’t blowing cool air, ensure the fan motor is ok. A bad fan motor can cause the unit not to blow.

If the unit is not working correctly, you might have a damaged circuit board. If this happens, then you need to contact a professional technician.

5. Unit Won’t Power On

You need to check the electrical connections if the LG air conditioner is not powering on. There could be a problem with the wiring.

Step 1: Test the Outlet

Test the outlet first. The outlet may be faulty. If so, then you need to change it.

To verify the outlet has power, turn off the main breaker switch. Then plug an appliance into the outlet. If everything works fine, you’re done, and the outlet has power.

Step 2: Check the Circuit Breakers

If the breaker did not trip, then check if the fuse blew. If yes, then you need to replace the fuse.

It’s possible that the circuit board got damaged during installation. In such cases, the best thing would be to get it replaced.

Step 3: Reset the Unit

Resetting the unit is another way to test if the outlet has power. Simply press the power button on the control panel and unplug the unit from the outlet. Then, plug it back in again.

If resetting doesn’t work, you need to call a professional technician.

Step 4: Reset the Power Plug

Reset the unit by turning it off and back on. If the resetting does not work, you need to call a technician who can fix the issue.

  • To test the power plug, press the test button on the control panel, press the Reset button, and finally press the Power button. 
  • You should contact a service technician if the unit does not power on. Upon powering on the unit, the safety relay may have been tripped.
  • It is necessary to press the Reset button on the power plug and then the Power button on the control panel to reset the unit when the indicator light is red or orange. 
Problems With the Remote Control

6. Problems With the Remote Control

Make sure the batteries in the remote are fully charged. Perhaps they need to be replaced, or maybe they are installed in the wrong direction. 

The battery contacts should be clean, and the batteries should fit tightly enough to make a good connection. 

Clean the sensors on the remote and the unit if the remote still does not work.

There is also a possibility that the remote may be too far away from the unit or at an angle that prevents it from working. 

It is also possible for the circuit board in the remote or unit to malfunction, but if so, the remote must be replaced.

LG air conditioner heat mode not working

If the air conditioner’s heat mode does not seem to be working, it may be because it is not set correctly or because it does not have a heat mode. 

There are other causes for this problem, such as dirty filters, circuit breaker problems, blocked airflow, or a defrosting issue.  

If none of these steps work, then reset the unit. 

LG air conditioner beeps but doesn’t turn on

There is a possibility that the AC beeps and does not turn on due to a tripped circuit breaker or a blown fuse. If you continually switch on and off the breaker or fuse, you will hear a beeping sound. Resetting the unit will help you determine if the problem is with the unit itself or the wiring.

Turn off the main breaker switch, then unplug the unit from the socket. Wait for 10 minutes. After that, plug the unit back into the socket.

If the unit powers on after resetting, the problem lies with the unit. If it didn’t power on, then the problem could lie with the wiring. You should contact a technician.

LG air conditioner beeps but doesn't turn on

LG air conditioners are freezing up

It happens when there is a blockage in the refrigerant line. The most common cause of this problem is debris in the system. Before calling a technician, you should check all vents and drains for any obstructions.

If the problem persists, you should call a professional technician. They will be able to clear out the lines and repair the damage.

LG ac is not cooling but the fan is running.

There are a few things that can cause this type of problem. First, the filter needs to be cleaned. It can be done by removing the cover plate on the front of the unit and cleaning the filter with a vacuum cleaner.

Here are a few other reasons:

  • Clogged air filter
  • There is no way for air to flow correctly through the air conditioner. Therefore, it reduces the cooling capacity of the air conditioner. 
  • The evaporator coils will freeze over if the air filter is clogged.
  • Try cleaning the air filter to remove debris.

LG air conditioner compressor keeps shutting off

When the temperature inside the unit rises above the desired level, the compressor shuts down. It is a safety precaution from the unit.

The overheat protection sensor, for example, may shut down the unit due to overheating, and the low refrigerant may contribute to this. Here are a few possible solutions:

  • Inspect the compressor for internal problems
  • Drain the unit
  • Check the temperature settings
  • Check the exhaust hose connection
  • Maintain your ac regularly
LG air conditioner compressor keeps shutting off

LG air conditioner error codes

There are some common LG air conditioner error codes. Some of the error codes are:

LG air conditioner error codeError description
1, 2, 4, 5, 6, 9, 10, 12Indoor Unit Faults
21, 22, 23, 25, 26, 27, 28, 29, 31, 32, 40, 41, 44, 45, 46, 48, 53, 60, 61, 62, 63, 65, 67Outdoor Unit Faults
21, 22, 23, 25, 26, 27, 29, 32, 35, 39, 40, 41, 43, 44, 45, 46, 48, 51, 53, 54, 60, 61, 62, 65, 67, 73LED Error Codes
E2, E3, E4P2 or FL01 h, 03 h, 05 h, 06 h Code appears in the display. F1, F2, or F3FL CH01Other Error Codes

LG Air Conditioner Maintenance Tips

If you want to keep your air conditioner running smoothly for a long time, then you need to follow some tips.

  • Check and change the filter regularly.
  • Clean the coils regularly.
  • Turn off the unit when you leave home.
  • Don’t run the unit continuously.
  • Replace the evaporator fan motor if needed.
  • Always try to follow the LG air conditioner troubleshooting manual
LG Air Conditioner Maintenance Tips

How do you reset an LG air conditioner?

For a reset, follow these steps:

  1. Unplug the air conditioner and leave it unplugged for at least 10 seconds.
  2. Plug it back in.
  3. Turn the air conditioner back on by pressing the power button.


Air conditioning systems are essential for our homes. They help us cool ourselves during summer and warm ourselves during winter. We must know how to fix them.                                 

If you’re experiencing problems with your LG air conditioner, there are a few things you can do to troubleshoot the issue. First, make sure nothing is blocking the cooling airflow of the unit. The next step is to verify that the unit is lodged correctly, the water is not leaking, it is blowing air, the power is on, the remote control works, the heat mode is on, and there are no beeping or errors codes and that the compressor is working. 

Finally, call LG customer service and provide them with your model number and serial number if you still cannot troubleshoot the problems.


What is a smart diagnosis of LG air conditioner?

A smart diagnosis of the LG air conditioning system includes checking the air conditioner through a smart application or a smartphone. This app allows you to monitor the air conditioner’s temperature, humidity, and energy consumption anywhere.
You can diagnose the air conditioner. First, download the free smart diagnosis app and connect it to the air conditioner. Then, open the app and start monitoring the data.
Note: This can be used only on specific LG air conditioner models. 

Why does my air conditioner keep running and not cooling?

If your air conditioner keeps running and not cooling, there could be several reasons for this problem.
Coil clogged or blocked
Grass, dirt, and other contaminants can find their way into this equipment. 
It can lead to a severe clog, which can cause a system malfunction.
The other thing to check is whether the temperature setting is correct and the fan is working. If this still doesn’t work, call an HVAC technician to come out and fix the issue.

Where is the reset button on the air conditioning unit?

Start by looking around the machine’s exterior along the bottom edge. The reset button on an air conditioner is usually red and visible, so it should be easy to find. If you don’t see the reset button outside the unit, you might be able to find it behind the service panel inside the unit.