How To Test A Refrigerator Or Freezer Temperature Sensor With A Multimeter

1. Unplug the Fridge
   • Safety first—disconnect the power to avoid electrical shock.
2. Locate the Sensor
   • The temperature sensor is usually located:
     • Clipped near the evaporator coils
     • Inside the fresh food or freezer compartments
     • Behind the rear panel in the fridge or freezer
     • Check your model’s tech sheet or service manual for more information
3. Disconnect the Sensor
   • Disconnect the sensor from the wiring harness to test independently
4. Set the Multimeter to Ohms (Ω)
   • Select the kΩ (kiloohm) resistance range if it’s not auto-ranging
5. Test Resistance at Room Temperature
   • Touch the multimeter probes to the sensor terminals
   • Compare the reading to the appropriate resistance chart
6. Test in Ice Water for Accuracy
7. Submerge the thermistor in a cup of ice water for 5 minutes to simulate a 32°F environment
8. Touch the meter probes to the thermistor wires
9. Compare the reading to the appropriate resistance chart based on a temperature of 32°F

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Refrigerator Thermistor Resistance Charts

General Electric (GE) Refrigerator Thermistor Resistance Chart