Kenmore Refrigerator Error Code r1

The r1 error code on a Kenmore refrigerator indicates that the refrigerator compartment temperature sensor (thermistor) is being read by the main PCB as either open or shorted. A thermistor is a resistive temperature-sensing component whose resistance changes predictably with temperature. When the main control board detects a resistance reading that falls outside the expected range, either infinitely high (open circuit) or near zero (short circuit), it throws the r1 fault and may disable normal cooling control to protect the system.

The most common root causes include a failed thermistor, a break or short in the sensor wiring harness, or a corroded/loose connector at the sensor end or at the main PCB. Physical damage to the wire routing path, moisture intrusion into connectors, or vibration-induced connector fatigue can all produce an open or shorted reading even if the sensor itself is electrically intact. Because the board relies on this sensor to regulate compressor and fan cycling in the refrigerator compartment, a faulty reading can result in temperature instability, continuous running, or a complete shutdown of cooling.

Diagnosis begins with a thorough inspection of all wiring connections between the refrigerator compartment sensor and the main PCB. Connectors should be checked for corrosion, bent pins, and proper seating. If connections are clean and secure, the thermistor itself should be tested with a multimeter to confirm its resistance is within spec for the ambient temperature. A reading of infinite resistance confirms an open sensor, while a reading near zero ohms confirms a short. If wiring and connectors test good but the board continues to report r1, the main PCB itself may be misreading an otherwise functional sensor.