If none of the other components are defective, consider replacing the main control board.
Before replacing the main control board, test all of more commonly defective parts. The main control board might be defective. If the compressor is defective, it must be replaced by a licensed technician.
If there is an open circuit, the compressor is likely defective. Use a multimeter to test the continuity between the electrical pins on the side of the compressor. If you have determined that all of the other components are working properly, check the compressor. Before replacing the compressor, first check all of the more commonly defective parts. If the compressor is not working, the refrigerator won’t cool. The compressor is a pump which compresses the refrigerant and circulates the refrigerant through the evaporator and condenser coils. If the windings do not have continuity, replace the evaporator fan motor. Finally, if the motor does not run at all, use a multimeter to test the motor windings for continuity. Additionally, if the motor is unusually noisy, replace it. If the fan blade does not turn freely, replace the fan motor. To determine if the evaporator fan motor is defective, try turning the fan blade by hand. If this occurs, the freezer may still get cold, while the refrigerator will not get cold. If the evaporator fan is not working, it will not circulate the cold air to the refrigerator compartment. On refrigerators with only one evaporator, the evaporator is located in the freezer compartment. Some refrigerators have more than one evaporator fan motor. The evaporator fan motor draws air over the evaporator (cooling) coils and circulates it throughout the refrigerator and freezer compartments. If the condenser fan motor does not have continuity, replace it. If no obstructions are present and the fan blade spins freely, use a multimeter to test the fan motor for continuity. If the blade does not spin freely, replace the condenser fan motor. Next, try turning the fan motor blade by hand. To determine if the fan motor is defective, first check the fan blade for obstructions. If the condenser fan motor is not working properly, the refrigerator won’t cool properly. The condenser fan motor draws air though the condenser coils and over the compressor. Check the condenser coils to determine if they are dirty-if the condenser coils are dirty, clean them. If the coils are significantly dirty, the refrigerator will not be able to maintain the proper temperature. As debris builds up on the coils, the refrigerator becomes less efficient, causing the refrigerator to work harder to cool down. If the condenser coils are dirty, they won’t dissipate the heat effectively. They dissipate heat as refrigerant passes through them. The condenser coils are usually located under the refrigerator.
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