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Repair and disassembly guides for food cooling appliances including refrigerators, freezers and fridge-freezers.

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LG LFC20770ST fridge/freezer that stopped cooling and freezing

Both fans are clean and working correctly, the compressor is warm/hot. The evaporator in the freezer is warm and not getting cold. This does not seem to be a fan or ice problem(there is no ice).


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I had this problem also. We switched the fan and are still hit and miss on a cool refrigerator.

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We had this problem. Everything in the freezer thawed out. I called for service and emptied the freezer into our large garage freezer. The next day the freezer was working normally. This has happened again since. It seems the freezer cannot be loaded more than 2/3 full. If it gets very full this happens.

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Same problem here. Everything seems fine with the fan and compressor but the freezer is not cooling enough. Any tips/suggestions out there?

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Android 维修工具包

一个新的屏幕或电池就在一个套件之内。

现在开始购物

Android 维修工具包

一个新的屏幕或电池就在一个套件之内。

现在开始购物

3 Answers

已选择的解决方案

Cause 1

Condenser Fan Motor

The condenser fan motor draws air though the condenser coils and over the compressor. If the condenser fan motor is not working properly, the refrigerator won’t cool properly. To determine if the fan motor is defective, first check the fan blade for obstructions. Next, try turning the fan motor blade by hand. If the blade does not spin freely, replace the condenser fan motor. If no obstructions are present and the fan blade spins freely, use a multimeter to test the fan motor for continuity. If the condenser fan motor does not have continuity, replace it.

Cause 2

Evaporator Fan Motor

The evaporator fan motor draws air over the evaporator (cooling) coils and circulates it throughout the refrigerator and freezer compartments. Some refrigerators have more than one evaporator fan motor. On refrigerators with only one evaporator, the evaporator is located in the freezer compartment. If the evaporator fan is not working, it will not circulate the cold air to the refrigerator compartment. If this occurs, the freezer may still get cold, while the refrigerator will not get cold. To determine if the evaporator fan motor is defective, try turning the fan blade by hand. If the fan blade does not turn freely, replace the fan motor. Additionally, if the motor is unusually noisy, replace it. Finally, if the motor does not run at all, use a multimeter to test the motor windings for continuity. If the windings do not have continuity, replace the evaporator fan motor.

Cause 4

Start Relay

The start relay works in conjunction with the start winding to start the compressor. If the start relay is defective, the compressor may sometimes fail to run or may not run at all. As a result, the refrigerator will not be cold enough. To determine if the start relay is defective, use a multimeter to test it for continuity between the run and start terminal sockets. If the start relay does not have continuity between the run and start terminal sockets, replace it. In addition, if the start relay has a burnt odor, replace it.

Cause 5

Temperature Control Thermostat

The temperature control thermostat directs voltage to the compressor, evaporator fan motor, and condenser fan motor (if applicable). If the temperature control thermostat is not working properly, it may prevent the refrigerant system from running. To determine if the thermostat is defective, rotate the thermostat from the lowest setting to the highest setting and listen for a click. If the thermostat clicks, it is not likely defective. If the thermostat does not click, use a multimeter to test the thermostat for continuity. If the temperature control thermostat does not have continuity at any setting, replace it.

Cause 6

Temperature Control Board

The temperature control board provides voltage to the compressor and fan motors. If the temperature control board is defective, it will stop sending voltage to the cooling system. However, this is not a common occurrence. Control boards are often misdiagnosed—before replacing the control board, first test all of the more commonly defective components. If none of the other components are defective, consider replacing the temperature control board.

Cause 7

Start Capacitor

The start capacitor provides a boost of power to the compressor during start-up. If the start capacitor isn’t working, the compressor may not start. As a result, the refrigerator will not cool. To determine if the start capacitor is defective, test it with a multimeter. If the start capacitor is defective, replace it.

Cause 8

Thermistor

The thermistor monitors the refrigerator temperature and sends the temperature reading to the control board. The control board regulates power to the compressor and evaporator fan based on the thermistor readings. If the thermistor is defective, the compressor and evaporator fan may not run when necessary. As a result, the refrigerator will not be cold enough. To determine if the thermistor is defective, test it with a multimeter. The thermistor resistance should change in conjunction with the refrigerator temperature. If the thermistor resistance does not change, or the thermistor does not have continuity, replace the thermistor.

Cause 9

Compressor

The compressor is a pump which compresses the refrigerant and circulates the refrigerant through the evaporator and condenser coils. If the compressor is not working, the refrigerator won’t cool. However, this is rarely the case. Before replacing the compressor, first check all of the more commonly defective parts. If you have determined that all of the other components are working properly, check the compressor. Use a multimeter to test the continuity between the electrical pins on the side of the compressor. If there is an open circuit, the compressor is likely defective. If the compressor is defective, it must be replaced by a licensed technician.

Cause 10

Main Control Board

The main control board might be defective. However, this is almost never the cause. Before replacing the main control board, test all of more commonly defective parts. If none of the other components are defective, consider replacing the main control board.



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按维修分数 5

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Hello Mayer, thanks for your response. I read your response in another post and have checked both fans. They are working correctly.

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Thank you for this Mayer. Very thorough!

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@gofigure hope you got the problem solved. I usually just post the most frequent cause so as not to overwhelm

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Hi Mayer, I called someone in and it needs a new compressor. Quote is $1000-$1300 and a replacement fridge is $1250 brand new. Any thoughts?

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Go into one of these older appliance repair places and see what they may have. They will probably take your old machine in trade. You may be able to get a very good one for cheap.

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LG has a problem with their compressor. They used plastics, wearers out within 3 years. Lg does have a 7 year parts warranty. Call Sears repair they can replace the compressor for about $300 labor.

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Yup. Ours was 3.5 years old, but didn't get used for the first 6-9 months while we were renovating. I'd like to think a replacement compressor would NOT be made of plastic, but I doubt it.

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This is the part and it does not appear to be plastic: https://www.searspartsdirect.com/part-nu...

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We are getting a replacement Fridge from Sears since they can’t fix our LG. The fridge defrost element has been replaced three times and still frosts over, the freezer hasn’t worked since our first repair call over three months ago and four repair visits. LG is bad, all repair guys tell me dont order LG. I’m looking at a GE profile now made by Haier, now a Chinese company. Don’t know if it’s better but if I knew what to buy I would pay more for a reliable well made fridge. This has a lot of costs of time, food, and lost work time that would total thousands of dollars. Worth paying more for something that works.

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