The freezer temperature sensor ensures the compartment stays at the target freezing temperature (typically 0°F / -18°C). A fault here can cause the freezer to run continuously, over-freeze, or fail to maintain safe temperatures.
Common Causes
- Sensor failure due to extreme cold cycling over many years
- Ice buildup around the sensor insulating it from air
- Wiring damage from ice expansion and contraction
- Failed connector at the control board
Solutions
- Defrost the freezer manually — excessive ice buildup can insulate the sensor and create false readings. Unplug the unit and allow a full thaw before testing.
- Inspect sensor placement — it should be in free airflow, not buried in ice or touching a wall directly.
- Check connector pins — clean any corrosion with electrical contact cleaner and reseat the connector firmly.
- Measure resistance — same method as the fresh food sensor; compare reading to your model’s specification in the service manual.
- Replace the freezer sensor — a straightforward swap; ensure the replacement matches your model number exactly.