LG Refrigerator Not Cooling. Causes and Solutions

The LG refrigerator is efficient and reliable, making it one of the top choices when buying a fridge for your home.

However, as with any appliance, you can be faced with technical issues from time to time. One of the most common problems owner’s face is that the refrigerator not cooling enough, which if not corrected can result in your food and beverages getting spoiled.

Common Reasons for LG Refrigerator Not Cooling

inside refrigerator

There can be several reasons for your LG refrigerator not cooling enough. Luckily, most of these reasons do not require elaborate solutions and can be solved quickly by following this guide.

Here are some initial checks and adjustments you should make prior to looking any deeper.

  1. It is essential to check if your fridge is at the recommended optimal temperature. According to LG, you should set the refrigerator at 37 degrees and the freezer at 0 degrees. Setting the temperature too high or too cold could affect the cooling.
  2. Properly check the cooling vents for any dirt and clean them thoroughly. You will find the multi-flow air vents at the back of the unit.
  3. Obstruction in air circulation can affect the performance of the refrigerator. Check if anything is blocking airflow and change settings to release.
  4. One principal reason why food items in your LG refrigerator are not cooling is that the doors are not closed properly. Make sure the mullion flap has sealed the door tightly, and the compartments are not overloaded or disorganized to prevent the doors from closing all the way.
  5. Make sure your fridge is not on a frost cycle. Defrosting can sometimes cause the food to go sour. Once the process is complete, the cooling performance of your unit will return to normal.
  6. Make sure the appliance is not on Demo or display mode. If yes, then for most models, open any refrigerator door and press the REFRIGERATOR and ICE PLUS buttons simultaneously for 5 seconds.

After making the above checks and adjustments, if your LG refrigerator is still not cooling to your liking, you should move onto the following, more elaborate checks.

Dirty Condenser Unit and Coils

One of the most common reasons for your LG refrigerator not cooling enough is dirty condenser coils located under the fridge. You can access them from the back of the unit.

These coils cool the warm air underneath the fridge. If they are not clean, they will not cool the warm air.

Unplug your LG refrigerator and check the condenser coils underneath. Things like debris, stubborn dirt scrapes, and even pet hair can dirty the condenser coils and affect their performance. If the condenser coils are filthy, clean them with a condenser cleaning coil brush for this. Sweep the area thoroughly and return the refrigerator to its initial position and run the unit as usual.

Wait at least 6 hours to check if the cooling has improved.

Faulty Condenser Fan Motor


Another reason your LG refrigerator might not be cooling enough is a faulty condenser fan motor. A defective fan motor will cause an increase in cabinet temperature and the overheating of the compressor as its job is to draw air over these components.

Once again, unplug the LG refrigerator and check for the fan motor. Do not be in a rush to replace the motor, which can be pretty costly.

First, check that nothing is obstructing the fan blade. If so, remove the obstruction and move the fan blades while the LG fridge is still unplugged. You can try spaying the motor shaft with penetrating oil to aid free movement. If it moves quickly, the next step is to check the fan windings. If not, the condenser fan motor will need replacement.

To check condenser fan motor windings, use a multimeter. Use an auto-ranging or manual ranging multimeter to test if the motor has shorted and needs replacement.

Now, use the multimeter to test the wiring continuity. To check for broken wires, set the multimeter to Ohms and try it for continuity. No continuity indicates a defective condenser fan motor. You should then replace the motor.

Faulty Evaporator Fan Motor

fridge evaporator

Another reason your LG fridge might not be cooling to your liking is a defective evaporator fan motor that needs replacement.

The evaporator fan motor draws air to circulate over the evaporator coils, cooling it in the process. Depending on different models in the refrigeration system, it also circulates the cooled air through the fan motors into the refrigerator and freezer compartments.

The procedure to test both the fan motors, the condenser fan motor, and the evaporator fan motor is similar.

Locate evaporator fan motor in the freezer compartment with the electrical supply to the refrigerator still off.

Make sure the evaporator fan blades can move freely. If yes, then check the fan motor for continuity using the multimeter. If the multimeter shows continuity and the fan is not making a lot of noise, the evaporator fan motor is likely not the reason for your cooling problem.

If any of the tests fail, you can contact LG support for a new evaporator fan motor if it is still under your parts warranty limit and replace the old one with the new one.

Failed Start Relay

The start relay is an essential part of the cooling system since it works with the compressor to start it up.

A faulty start relay will hinder the performance of the compressor unit. It may be so that the compressor might not work at all.

To check for a malfunctioning or inoperative start relay, unplug the refrigerator and move it out so you can access the back panel. You will find it near the compressor at the bottom.

You will again need a multimeter to test the start relay for continuity. Perform the test between the run and start terminals. If there is no continuity, your best bet would be to consider replacing the faulty component by getting in touch with the LG support service.

Temperature Control Thermostat Not Working

One of the most important electrical components in a refrigerator is the temperature control thermostat, which provides voltage to the fan motors and the compressor. If the thermostat isn’t working correctly, your LG refrigerator will not have optimal performance.

Access the temperature control thermostat from the back at the bottom of the unit.

An easy check is to turn the knob from the lowest setting to the highest to hear a click sound. If you hear the sound, then the thermostat is most likely not the issue.

To be sure, you can use the multimeter and check for continuity. If it shows continuity, then the thermostat is working fine.

Defective Start Capacitor

If there is a problem with your start capacitor, then the compressor would not start up properly.

Use a multimeter to test it for continuity with the power supply to the refrigerator still off.

Faulty Readings from the Thermistor

The thermistor keeps track of the refrigerator temperature and is responsible for sending readings to the main control board. In case of incorrect readings, the cooling would not be according to your set temperature.

Check to see if it is broken using a multimeter and see if it is working correctly.

Compressor Failure

Even though compressor failure is not very common, it can be a probable cause for fluctuating cooling in your refrigerator.

The compressor compresses the refrigerant, which then moves through the compressor and evaporator coils. Thus, it is incredibly vital that it works properly.

A multimeter should be used to test for functionality between the electrical pins on the side. An open circuit will indicate a faulty compressor that needs replacement.

Defective Temperature Control Board

Even though most people find the cause of the cooling problem by this step, if all else fails, you can try to replace the temperature control board and see if the performance of your refrigerator gets better.

Defective Main Control Board

If all other electrical components of the refrigerator seem to be working fine, you can replace the main control board of the fridge. However, this is a costly replacement that requires skills to be appropriately changed. A better option would be to invest in a new refrigerator altogether.

Frequently Asked Questions

Is there a reset button on LG refrigerators?

To reset an LG refrigerator, press and hold the LOCK/ICE PLUS button and the REFRIGERATOR button simultaneously. The controls are visible when you open the right door of the fridge.

Your fridge will be reset when the control panel beeps and temperature settings are visible on display.

How do I reset my refrigerator compressor?

To reset your fridge compressor:

  1. Locate the power cord at the back and unplug it from the power outlet.
  2. Leave the fridge unplugged for a few minutes after the power shuts off.
  3. Turn the temperature controls inside the refrigerator and the freezer to “OFF” 0r “0,” depending on the model.
  4. Plug the refrigerator into the wall outlet again.
  5. Adjust the refrigerator and freezer’s temperature controls according to your needs.
  6. Allow the refrigerator at least 24 hours to adjust to a constant temperature.

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