Freezer: Not cooling

If the freezer isn’t cold and the compressor doesn’t run, possible causes are a failed compressor start relay or a defective control system. If the compressor does runs, likely causes are a defective compressor or a refrigerant leak; only a licensed service technician can fix these two refrigerant system problems.

These repairs may help solve your Freezer problem:

Replace the freezer start relay and overload

Compressor start relay

The compressor start relay starts the compressor and keeps it running until the compressor cycles off. Replace the start relay if it’s broken and the compressor doesn’t run. In some situations, a wiring failure could be causing the problem, and repairing the start relay wiring will fix the problem.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the freezer cold control thermostat

Temperature control thermostat

The cold control thermostat, located in the control housing, regulates the freezer temperature by cycling the compressor on and off. The sensor bulb on the cold control thermostat monitors freezer temperature. Replace the cold control thermostat if it doesn't cycle the compressor properly to maintain freezer temperature.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the freezer electronic control board

Electronic control board

The electronic control board—also called the main control board or the power control board (PCB)—manages the compressor and the defrost cycle. The control board activates the compressor to keep the freezer cold and runs the fans. The electronic control board monitors temperature sensors to control freezer temperature and the defrost cycle. Replace the electronic control board if it’s not working properly.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the freezer thermistor

Thermistor

The thermistor is a temperature sensor inside the freezer. The electronic control board uses the reading from the thermistor to cycle the compressor on and off to maintain freezer temperature. Replace the thermistor if it’s not sensing freezer temperature accurately.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the freezer defrost bi-metal

Defrost sensor

The freezer defrost sensor—also known as the defrost bi-metal or defrost termination thermostat—is next to the evaporator. It trips when the evaporator temperature gets too high, to protect the evaporator from overheating. When it trips, the defrost bi-metal shuts off the defrost heater. A defective defrost bi-metal prevents the defrost heater from working, causing frost to build up on the evaporator, causing a warmer freezer interior. Replace the defrost sensor if it prevents the defrost heater from working.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the freezer defrost heating element

Defrost heater

The defrost heating element melts frost from the evaporator fins to improve cooling. If the defrost heating element fails, excessive frost covers the evaporator fins. Replace the defrost heating element if it’s damaged or not heating.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the freezer evaporator fan

Evaporator fan

The evaporator fan mounts on the evaporator assembly. It moves air across the evaporator fins and through the cabinet for cooling. The freezer won't cool properly when the evaporator fan breaks. If the evaporator fan doesn't run when activated, replace it.

For manuals, repair guides, and specific part recommendations, enter your model number.

Clean the freezer condenser coils

Condenser

Dust-covered freezer coils prevent the freezer from running efficiently and cooling properly. Unplug the freezer and clean the condenser coils using a coil brush. Vacuum up the dust. Clean the grill below the freezer door to allow proper air flow to the condenser.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the freezer condenser fan motor

Condenser fan

The condenser fan is in the machine compartment of the freezer next to the compressor. It moves air across the condenser coils to help cool the hot refrigerant coming out of the compressor. Replace the condenser fan if it fails to run when activated.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the freezer compressor

 Compressor

The compressor is a pump that an electric motor rotates. The compressor is the problem if the motor won’t start when the start relay actives it, or if the motor runs but the pump doesn't compress the refrigerant. Have a service technician replace the compressor, because this repair requires access to the sealed refrigerant system.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the freezer defrost timer

Defrost timer

The defrost timer controls the intervals between defrost cycles and limits the length of the cycle. During the defrost session, the timer activates the defrost heating element and prevents the compressor from running, so frost melts from the evaporator fins. Replace the defrost timer if it doesn’t control the defrost heater and compressor properly.

For manuals, repair guides, and specific part recommendations, enter your model number.