Kenmore Refrigerator Error Code 3

Error code 3 on a Kenmore refrigerator indicates an abnormal condition detected in the primary refrigerator temperature sensor, also referred to as Refrigerator Sensor 1. The main PCB continuously monitors this sensor to regulate cooling cycles and maintain safe food storage temperatures. When the control board detects a signal that falls outside the expected range, it triggers error code 3 to alert that the sensor circuit has either opened completely (a cut or broken wire) or closed upon itself (a short circuit). Both conditions produce a temperature reading the board recognizes as impossible or implausible.

The first diagnostic step is to inspect the connector labeled CON7 on the main PCB. A loose or corroded connection at CON7 is the most frequent cause of this fault, because intermittent contact at the connector can mimic the electrical signature of a broken sensor wire. Before replacing any components, the connector should be firmly reseated and the terminals inspected for corrosion, bent pins, or debris. This quick check often resolves the fault without any parts replacement.

If the connector is secure and the error persists, the wiring harness running from CON7 to the temperature sensor should be traced for physical damage such as pinching, chafing, or rodent damage. If the harness is intact, the sensor itself should be tested for proper resistance output. A sensor with an open circuit will read infinite resistance, while a shorted sensor will read near zero ohms. A faulty sensor or damaged harness will require replacement to restore normal operation.