How To Identify If An LG Refrigerator Linear Compressor Is Faulty – Quick Guide

Most common LG refrigerator Cooling failures

LG refrigerator linear compressor is the first thing everybody thinks when their LG refrigerator stops cooling. Very possibly it could be a faulty compressor but there are some other components in the fridge also could cause the same exact failing effect. Here are some common signs of a bad compressor of an LG fridge:


A properly working compressor makes a heavy buzzing sound and clicks on/off during its running. Listen carefully to hear these sounds, if you do not hear them, the compressor may be faulty.
Also, if these on & off clicking becomes too frequent, the compressor may be faulty too. Specifically for LG refrigerator linear compressor most of time sound is very obvious, for technicians obviously since service techs repair compressor all the time and can detect a faulty compressor with irregular sound easier and faster than a home owners. But still sound for LG refrigerator linear compressor is not a reason to replace the compressor, tech still has to check voltage, resistance and level of the freon inside the seal system. 


The compressor workflow can tell you if it’s bad or not. If your LG refrigerator linear compressor is running non-stop, it certainly means that it is broken. Similarly, it’s pretty clear if it’s not running at all, this indicates that the compressor is faulty. Most faulty LG refrigerator linear compressors when running non stop, they get very hot and it has to do something with wiring inside the compressor. It has to be replaced anyway since compressor comest sealed in one piece. 
Additionally, if the fridge is not cooling properly, it can also be caused by other components, since other faulty parts can cause the same problem as the compressor.


The compressor is hot while running, but it should not overheat. You can touch it with your hand if it is hotter than usual, this is a sign of a malfunction, but be careful to not burn your hand. Cold temp is normal for some newer LG refrigerator linear compressors come with R600 which is newer type of freon. If temp is too cold and compressor is quiet, it means power control board might be faulty. 

How To Fix LG Linear Compressor Fridge When It’s Not Cooling

Check the following to fix an LG linear compressor fridge:

Condenser Coils

Unplug the fridge, disconnect the water supply line, and move the fridge away from the wall. Then, open the bottom rear access panel, where the condenser coils are located. Use brush and vacuum to clean the dust. Dirty condenser coils prevent the dissipation of heat from the refrigerant and reduce its cooling capacity. LG refrigerator linear compressor is very important to keep the condenser coil clean and has to be vacuumed once a year. 

Condenser Fan

The condenser fan is located next to the condenser coils and is used to cool down the condenser coils. Turn the fan blades to see if they are moving freely. If they are turning heavily, it means that the fan is faulty and needs to be replaced.
If the blades spin freely, then check the fan motor. Use a multimeter to check for continuity of the fan motor. If it doesn’t have one, then you should replace it.

Evaporator Fan

The evaporator fan is located in the freezer behind a panel. To check its condition unscrew this panel at the rear wall in the freezer.
If there is a frost on this fan, unplug the fridge for some hours to melt that frost. Or you may also use a hairdryer.
However, the fan motor may also be faulty, use a multimeter to check it. It can only be replaced if it’s faulty.
Most of the time it is the frost that prevents the evaporator fan from working, and eventually, the refrigerator will stop cooling.

Start Relay

The start relay is a little box attached to the compressor. The compressor itself located the back panel at the bottom of the refrigerator.
Disconnect this box and shake it to see if it rattles. If it makes a rattling sound, it is most likely faulty.
Also, use a multimeter to check it for continuity.
If the start relay is faulty, it cannot start the compressor to work and leads to the refrigerator warming up.

Temperature Control Thermistor

Firstly, use a multimeter to check the temperature control thermistor for continuity. Notice that the continuity or resistance should change when you are changing the thermistor to different thermistor. If it remains the same, it means that the thermistor is faulty, and needs to be replaced. The purpose of the thermistor is to send voltage to the control board, and control board sends power to the compressor, evaporator, or condenser fans. So if the thermistor is faulty, none of these parts will receive voltages to start up. And it leads to the fact that the refrigerator stops cooling. Some times wires in the thermistors connector get moisture and temp reading will be effected. 

Bimetal or thermostat. Defrost issue

Just like the other components check the bimetal/thermostat with a multimeter for continuity.
Bimetal is located in the evaporator coils in the fresh food section or a freezer section in the LG refrigerator linear compressor. The purpose of the bimetal is just a safety, like a fuse. It protects heater from getting overheating and prevents further damage to the inner plastic surroundings. This problem known as a defrost issue. The common sing is when rear cover gets covered with snow inside the freezer in lG refrigerator linear compressor. 

lg refrigerator linear Compressor

The LG refrigerator linear compressor is located behind the bottom back access panel of your fridge. To get to it, you need to unscrew some screws. Before doing this, don’t forget to unplug your fridge. Check its electrical pins for continuity. If the test results in an open circuit, it means the compressor is faulty and needs to be replaced.

The compressor is one of the most important parts of the refrigerator and its cooling system. Its main purpose is to compress the refrigerant and circulate it inside the coils. 

LG linear compressor problems in LG refrigerators

LG refrigerator other issue.

Lg is very famous with a problematic compressor. LG refrigerator linear compressor can be replaced by LG refrigerator repair service company or by someone who has experience replacing LG compressors. However, it’s not the only cause of a non-cooling refrigerator, but we should not overlook it. Other components that prevent the proper work of the cooling system are temperature control and main control boards, but they are less like to be the culprits.We recommend leaving these tasks to the discretion of a qualified specialist, as this can be dangerous if you do not have the proper knowledge. A good LG refrigerator repair technician should quickly handle this problem.

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