Kenmore Refrigerator Error Code Er 2

The Er 2 error code on a Kenmore refrigerator indicates the control board has detected an abnormal signal from the freezer temperature sensor, also called the freezer thermistor. This condition is triggered when the sensor circuit reads outside the expected resistance range, which happens when there is either a cut (open circuit) or a short circuit in the sensor wiring. The freezer thermistor is a negative temperature coefficient (NTC) resistor that changes resistance as temperature changes, allowing the control board to monitor freezer compartment temperature. When the circuit is broken or shorted, the board cannot receive valid temperature data and flags the fault.

The first diagnostic step is to inspect connector CON6, which is the designated wiring harness connection point for the freezer sensor circuit. Loose, corroded, or improperly seated connectors at CON6 are among the most frequent triggers for this code, since a poor connection mimics an open circuit condition. After confirming the connector is secure, the technician should inspect the sensor wiring harness for any visible damage such as pinched, frayed, or broken wires, which can occur near cabinet hinges or anywhere the harness routes through tight passages.

If the wiring and connector check out, the freezer thermistor itself should be tested using a multimeter. A functioning NTC thermistor will show measurable resistance that decreases as temperature rises. A reading of infinite resistance (open circuit) or near-zero resistance (short) confirms sensor failure. If the sensor and wiring both test correctly, the main control board may be failing to read the circuit accurately and could require replacement.