Kenmore Refrigerator Error Code Er rS

Er rS means the control board has detected a problem with the refrigerator compartment temperature sensor, either a short circuit or a disconnection in that sensor circuit. The board can no longer get a valid temperature reading from the fresh food section. This is not always a failed sensor, since a loose wire connector can produce the same code.

Operating the refrigerator with Er rS active is risky for stored food. Without a working sensor signal, the control board cannot regulate the fresh food compartment temperature accurately, which means the refrigerator may run too warm or too cold without the user realizing it. Perishables should be moved to an alternate refrigerator or monitored closely with a standalone thermometer until the fault is resolved.

Disconnect the sensor connector and set a multimeter to measure resistance (ohms). Probe the two terminals on the sensor side of the connector. At roughly 77 degrees Fahrenheit, a healthy thermistor typically reads around 5,000 ohms, and resistance should decrease as temperature increases. A reading of zero ohms indicates a short, while an open line (OL or infinite resistance) indicates a break in the sensor. Either reading confirms a bad sensor that needs replacement. Also check the white-to-white harness wires for continuity separately to rule out a wiring fault before replacing the sensor.

Start by locating the refrigerator sensor connector and checking for any loose or disconnected plugs. If the connector is secure, use a multimeter to measure resistance across the white-to-white wires in the sensor circuit and compare the reading to the specification in your service manual, which is typically around 5,000 ohms at room temperature for most Kenmore thermistors. If resistance is out of range, replace the refrigerator sensor. If wiring and the sensor both test good, the main control board may need replacement.

If the fix is simply reseating a loose connector, there is no parts cost at all. A replacement refrigerator compartment temperature sensor typically costs between $15 and $40 depending on the model. If the wire harness needs replacement, expect $20 to $60 for the part. A main control board, the least likely cause, can range from $100 to $200 or more. Professional labor adds $80 to $150 per hour on average, so confirming the actual failed component before ordering parts keeps total repair costs down.