Safety: Unplug the freezer before accessing sensors or the control board.

Steps to stabilize temperature:

Verify door usage: Frequent long openings can cause fluctuations; minimize door open time.
Test cabinet thermistor: Access the thermistor location (usually behind an interior panel) and measure resistance at a known temperature. Replace the GE cabinet thermistor if readings are unstable or out of spec.
Check connections: Ensure the thermistor harness is firmly connected to the main control board and not corroded.
Inspect evaporator fan: Confirm the fan runs consistently when the compressor is on. Replace the evaporator fan motor if it stops intermittently.
Control board: If sensors and fan are good, but temperature still swings widely, the main control board may be mismanaging cycles and should be replaced.

Tip: Use an appliance thermometer to monitor actual temperature over 24 hours when evaluating fluctuations.

Freezer temperature fluctuates widely, sometimes freezing too hard and then warming

Possible Causes