Kenmore Refrigerator Error Code Er 4

Er 4 indicates that the control board has detected an abnormal condition on the secondary refrigerator temperature sensor, also called the middle room sensor. The board has identified either an open circuit, such as a cut wire, or a short circuit in that sensor circuit. This fault can affect the refrigerator's ability to monitor and maintain accurate temperatures in that zone.

A reset may temporarily clear the Er 4 display, but the code will return if the underlying fault in the sensor circuit has not been corrected. The control board will re-detect the abnormal sensor signal during its next monitoring cycle. A permanent fix requires addressing the wiring, connector, or sensor hardware directly.

If only the CON7 connector needs reseating, there may be no parts cost, though a service call fee may apply if you hire a technician, typically ranging from $75 to $150. Replacing the secondary temperature sensor is generally an affordable repair, with parts costs often falling in the $20 to $60 range depending on the specific model. If the control board is the root cause, repair costs can rise significantly, often reaching $150 to $350 or more including labor.

Start by checking the connector at CON7 for a loose or corroded connection, and reseat it firmly. If the error persists, inspect the sensor wiring harness for any cuts or damage and test the harness for continuity with a multimeter. If the wiring is intact, test the sensor's resistance at a known temperature to determine whether the sensor itself has failed and needs replacement.

The refrigerator may continue to run with Er 4 active, but temperature regulation in the affected zone could be compromised. This increases the risk of inconsistent cooling and potential food spoilage. It is advisable to address the fault promptly and monitor food temperatures closely in the meantime.