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 6-12 months. If the condenser coils are dirty, they won’t be able to dissipate heat effectively, greatly reducing the cooling capacity of the freezer. If the condenser coils are dirty or have not been cleaned in a while, clean them.
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.
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.