Whirlpool Refrigerator Error Code RC & DEFROST SENSOR

This error code means both the refrigerator compartment thermistor and the defrost thermistor have been detected as failed by the control board. These sensors monitor temperatures inside the fresh food section and at the evaporator coil. When both fail together, the refrigerator cannot regulate cooling or defrost cycles accurately. The fault is confirmed through service diagnostics, specifically during the thermistor test that runs automatically after the Heater Off step.

Continued use is not recommended once this error is active. Without functioning temperature sensors, the control board cannot accurately manage cooling or defrost cycles, which can result in inconsistent temperatures and potential food spoilage. Frost may also accumulate on the evaporator coil if the defrost system is impaired. The issue should be diagnosed and repaired as soon as possible to protect stored food and prevent further damage.

A simple power reset may temporarily clear the error code from the display, but it will not resolve the underlying fault. If both thermistor circuits are genuinely defective or if there is a wiring or control board issue, the code will return once the refrigerator resumes normal operation. The correct approach is to run the service diagnostics thermistor test to identify and repair the actual cause before attempting to clear the fault.

A knowledgeable DIYer can inspect wiring connectors and reseat any loose connections, which sometimes resolves the fault without part replacement. However, properly diagnosing whether the sensors, the wiring harness, or the control board is at fault requires entering service diagnostics mode and interpreting the thermistor test results. Replacing parts without completing the diagnostic sequence often leads to misdiagnosis. If you are not comfortable working with appliance control systems, a professional technician is recommended.

Repair costs depend on what component has actually failed. Thermistor sensors are relatively inexpensive, typically in the range of $15 to $50 per sensor in parts. A replacement main control board, if that turns out to be the root cause, can range from $100 to $300 or more in parts alone. Adding professional labor, total repair costs can range from $150 to $500 depending on the diagnosis and parts required.