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Freezer not freezing

01 - Freezer Thermistor

The thermistor monitors the freezer 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 freezer may not freeze properly. To determine if the thermistor is defective, test it with a multimeter. The thermistor resistance should change in conjunction with the freezer temperature. If the thermistor resistance does not change, or the thermistor does not have continuity, replace the thermistor.
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02 - Freezer Control Board

Control boards are often misdiagnosed—before replacing the control board, first check more commonly defective parts. If you have determined that all of the other components are working properly, replace the main control board.
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03 - Condenser Coils are Dirty

If the condenser coils are located within the freezer walls, the coils do not require cleaning. However, if the condenser coils can be readily accessed from behind or under the unit, you should clean them every 6 to 12 months by using a soft bristle brush (or a dedicated condenser coil cleaning brush) to wipe off the coils in a circular motion. A vacuum cleaner with a nozzle attachment can also be used for hard-to-reach areas.
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04 - Freezer Evaporator Fan Motor

The evaporator fan motor draws air over the evaporator coils and circulates it throughout the freezer. If the evaporator fan motor is not working, the freezer will not cool. On most refrigerators, the fan motor will not run when the door is open. To check the evaporator fan motor, open the freezer door and then manually activate the freezer door switch. If the door switch is activated, but the evaporator fan motor won’t run, replace the evaporator fan motor.
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05 - Freezer Start Relay

The start relay provides power to the compressor. If the start relay isn’t working properly, the compressor may run intermittently or may not run at all. If the compressor won’t run, the freezer will not cool. To determine if the start relay is defective, unplug the freezer and remove the start relay from the compressor. Use a multimeter to test the start relay for continuity between the start and run terminals. If the start relay does not have continuity, or if it smells burnt, replace it.
Highly Likely

06 - Incoming Power Problem

Confirm the freezer is plugged in and there is power at the wall receptacle. You can plug another small appliance into the receptacle to confirm there is power. If there is no power, check the circuit breakers and GFCI (ground-fault circuit interrupter) outlets, if applicable, to confirm they have not tripped, or inspect any fuses to confirm none have blown. Plugging the unit’s power cord into a ground fault outlet is not recommended, but such an outlet can be reset to restore power by pressing in the button on the faceplate.
Highly Likely