If your LG refrigerator is not cooling as it should be, then there is most likely a problem with one of the refrigerator’s components that will need to be fixed. But before you can fix the problem, you first need to find the cause.
In this article, we will cover all of the most common causes so you can diagnose the culprit. This article covers all major LG refrigerator models, including:
LFX21976ST
LFX25950SB
LFX25950SW
LFX25950TT
LFX25976ST
LFX25991ST
LFX28978SB
LFX28978SW
LFX28979ST
LFX31925ST
LFX31935ST
LFX31945ST
LMX25984SW
LMX25986ST
LMX28988SB
LMX28988ST
LMX28988SW
LRDC22743ST
LRDC22744ST
LRSC26980SB
LSFS213ST
The first component to check is the condenser coils. Their role is to dissipate heat when refrigerant goes through them. Sometimes they get dirty and this causes your refrigerator to not be able to cool properly.
To check the condenser coils you need to:
The next component to check is the condenser fan motor. The purpose of the fan motor is to pull air through the condenser coils. When it stops working correctly, your fridge won’t cool.
You can check the condenser fan motor by:
Another possible cause of your LG refrigerator not cooling is a faulty evaporator fan motor. Depending on the exact model of your refrigerator, there will either be one or multiple evaporator fans. When they stop working, your refrigerator will not cool, as cold air is not being circulated from the freezer to the fridge.
To check the evaporator fan motor:
If you still haven’t solved the problem, then the next component to inspect is the start relay. This component of your refrigerator works with the start winding to make the compressor operate correctly. When it becomes faulty, the compressor will not work correctly, causing your refrigerator to not cool.
You can check it by:
Another possible cause of your refrigerator not cooling is a faulty temperature control thermostat. The thermostat is responsible for directing voltage to the evaporator fan motor, the compressor, and, if your fridge has one, the condenser fan motor.
You can check the temperature control thermostat by:
The start capacitor is another possible cause of a refrigerator not cooling. The start capacitor helps to power up the compressor when it starts up, and when it doesn’t work, the compressor will not be able to start, which results in your refrigerator not cooling correctly.
You can check it by:
The purpose of the thermistor is to monitor the temperature in the refrigerator and then communicate it to the control board. When it becomes defective, it will cause other components in the refrigerator to not work correctly.
The best way to check if it is faulty is to:
The next component to check is the compressor. The compressor is a pump that compresses the refrigerant and then circulates it through the evaporator and condenser coils. When it becomes faulty, the cooling system will stop working as it should. It’s quite an uncommon cause of the problem, so check all of the other possible causes first.
You can check the compressor by:
The temperature control board is another possible cause of the problem (albeit not a common one). This component provides the required voltage to the compressor and the fan motors, and when it becomes defective, it will stop the cooling system from working correctly.
Unfortunately, the temperature control board is difficult to test, so if you have tried all of the other components listed above, you should consider replacing the temperature control board and seeing if that solves the problem.
If you have checked every other component above and still haven’t found anything wrong, then the final action to take is to replace the main control board. It is quite uncommon for this to be the cause, but it can happen.
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