Kenmore Refrigerator Error Code Er rS — Refrigerator Compartment Sensor Failure
What this means
The Er rS error code on Kenmore refrigerators indicates the refrigerator compartment temperature sensor (thermistor) is reading an abnormal value — either open, shorted, or outside the expected range. This sensor tells the control board the current temperature so it can regulate the compressor and fan. A faulty sensor can cause the fridge to run too cold, too warm, or not at all.
Alternate codes: Er RS
Step-by-step fix
4 stepsCheck refrigerator temperature behavior
Note whether the fridge is too warm, too cold, or fluctuating. A sensor reading too low resistance makes the board think it's warm (runs compressor constantly). Too high resistance makes it think it's cold (doesn't run enough).
Place an accurate thermometer in the fridge to get an independent reading — compare it to what the display shows.
Locate the refrigerator thermistor
The refrigerator compartment thermistor is usually located at the top or rear of the fresh food section, often clipped to the wall behind a small cover or mounted near the air inlet from the freezer. Consult your tech sheet for the exact location.
The thermistor looks like a small capsule or bead on the end of two thin wires — it's small and easy to overlook.
Test the thermistor
Unplug the refrigerator. Disconnect the thermistor wires. Measure resistance with a multimeter. At room temperature (about 70°F/21°C), most Kenmore fridge thermistors read approximately 5,000–8,000 ohms. At 37°F (3°C), they read about 15,000–18,000 ohms. An open or zero reading indicates failure.
Place the thermistor in a glass of ice water to verify it responds to temperature changes — resistance should increase as it gets colder.
Replace the thermistor
Remove the clip or screw holding the old thermistor in place. Disconnect the wire connector. Plug in the new thermistor and secure it in the same location. Reassemble any cover panels.
Thermistors are very affordable — if you're testing and the reading is borderline, just replace it to be safe.
When to call a professional
If the new thermistor still shows the error, the main control board's sensor input circuit may be damaged. A technician can test the board and the full wiring path.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Refrigerator Compartment Thermistor
Part #WPW10316760 · $10–$25
Required if thermistor reads open, shorted, or out of range
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