The ambient sensor measures the temperature of the room in which the refrigerator is operating. The control board uses this data to adjust compressor cycling. Without accurate ambient readings, the fridge may over- or under-cool.
Common Causes
- Sensor located near a heat source (oven, direct sunlight) skewing readings
- Dust or grease accumulation on the sensor surface
- Sensor wire routed too close to the compressor heat
- Component aging
Solutions
- Check the refrigerator’s environment — ensure it is not placed next to an oven, in direct sunlight, or in an uninsulated garage during extreme temperatures.
- Clean the sensor — carefully wipe the sensor surface with a dry cloth to remove dust or grease.
- Verify the sensor location — consult your model’s service diagram to confirm the ambient sensor is installed in the correct position.
- Test resistance — compare to your manufacturer’s specification.
- Replace if faulty — ambient sensors are typically located near the top of the unit or inside the machine compartment at the rear.