How to Fix / Troubleshooting

Safety first: Unplug the freezer before accessing controls and wiring.

Steps:

Inspect the cabinet temperature sensor wiring and connector; reseat and secure.
On mechanical models, gently tap the thermostat knob area; if compressor cycles erratically, replace the thermostat.
Check for signs of moisture or corrosion on the main control board and connectors; clean and dry as needed.
Monitor the freezer with a separate thermometer to confirm fluctuations.
If intermittent issues persist after securing connections and replacing obvious faulty parts, the main control board may need replacement.

Freezer temperature fluctuates widely, sometimes freezing, sometimes too warm

Possible Causes