Kenmore Refrigerator Error Code Er rT — Room Temperature Sensor Error
What this means
The Er rT error code on Kenmore Elite refrigerators indicates the room temperature sensor (ambient thermistor) has failed. This sensor helps the refrigerator adjust its operation based on the surrounding environment. If it reads too high or too low, the compressor may run excessively or insufficiently. The sensor may be shorted, open, or simply disconnected.
Alternate codes: Er RT, ErRT
Step-by-step fix
3 stepsPower cycle the refrigerator
Unplug the refrigerator for 5 minutes. A temporary sensor glitch from a power fluctuation may clear after a reset.
Make sure the refrigerator is not near a heat source (oven, heating vent) that could affect the ambient sensor.
Locate and test the ambient sensor
The room temperature sensor is usually on or near the main control board at the rear bottom of the refrigerator. Test it with a multimeter — at room temperature (72°F), it should read approximately 5,000 ohms.
If the reading is 0 (shorted) or OL/infinite (open), the sensor has failed.
Replace the ambient sensor
Disconnect the sensor from the control board connector. Remove it from its mounting position. Install the new sensor and reconnect. Ensure the sensor is positioned in free air — not pressed against a component or the wall.
Some models integrate the ambient sensor into the control board — in that case, the board itself needs replacement.
When to call a professional
If the sensor reads correctly but the code persists, the control board's sensor input circuit may be faulty.
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.
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