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

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LG Refrigerator Not Cooling Properly, Fridge and Freezer both

I have a LMXS30776S/00 with both the refrigerator and freezer not cooling properly. Checked compressor (appears to be working), fans working, cleaned coils, no help.

Performed the voltage test on the main control board - CON201 (1&4 pin) after pressing the test switch. Voltage got up to ~50V Max. Left connector off and noticed LED blinking three times. Main Control Board? Thanks Brian

Risposto! Visualizza la risposta Anch'io ho questo problema

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Commenti:

Hi @brian_g ,

Not sure if this link is applicable as it is not quite the same model number (missing/00 at the end) but are you getting any error codes as per the description?

Apologies if this is not for your model.

da

Thank you for the message and link. Tomorrow I’ll look the manual over in more detail.

I haven’t gotten any error codes. I’m assuming I don’t have to put it into any test mode in order to see them?

Other than it not cooling everything appears normal. Thanks

da

Hi @brian_g ,

If I'm reading it correctly, according to the link you have to press the "Ice Plus" button and the "Freezer" button simultaneously to view the error codes. See Note near the top of the page in the link.

Cheers.

da

Thanks. No error coders at all. Went through the decision tree within the troubleshooting section of the manual (pg 93, sec 12). Voltage not sufficient from the Driver PCB CON201. I've ordered a new PCB and will install when it arrives today. I'll let you know if that fixes the issue. Thanks for the help

da

Did the board fix the problem? Mine is doing exact same thing but I’m getting 80 volts after the 30 second startup and manual calls for 200 volts

da

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Soluzione Prescelta

Here are the top three, there are seven other causes if these are OK:

Cause 1

Condenser Coils are Dirty

The condenser coils are usually located under the refrigerator. They dissipate heat as refrigerant passes through them. If the condenser coils are dirty, they won’t dissipate the heat effectively. As debris builds up on the coils, the refrigerator becomes less efficient, causing the refrigerator to work harder to cool down. If the coils are significantly dirty, the refrigerator will not be able to maintain the proper temperature. Check the condenser coils to determine if they are dirty—if the condenser coils are dirty, clean them.

Cause 2

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 3

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.

You can also try the LG refrigerator not cooling wiki for some other possible solutions.


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Thanks Mayer. I've cleaned the condenser coils and both motors are operational.

da

I updated my post with what to look at next.

da

What needed up being the trouble?

da

@rhiannonapple

@brian_g What ended up being the problem?

da

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I’m a refrigeration tech and I work on these daily. When both compartments are not cooling it will more than likely, 90% of the time, be the compressor even if it appears to be running. Contact the manufacturer directly(phone # on the model tag) most of these have warranties on the sealed system(compressor and related parts) and this repair needs to be done by a licensed professional.

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How expensive is the repair ?parts and labor?

da

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My lg fridge is about 20 degrees warmer than it should be. We are keeping our food in the freezer section just to keep it cold, but none of it freezes. I have cleaned coils and checked the fan. I also unplugged it for a day to ensure there was no ice build up. When I open the freezer I can see the fan slowing to a stop. Any ideas?

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Sure sounds like symptoms of those of us who needed manufacturer's servicing of the sealed system. Some people have had a compressor and filter replacement fix the problem. I needed the filter and evaporator.

da

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Brian Greeson sarà eternamente grato.
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