Samsung Refrigerator Error Code R-defroster sensor

The R-defroster sensor error means the control board has detected a fault in the refrigerator compartment defrost sensor circuit. The sensor is reporting a temperature reading below -58°F or above 150°F, which indicates a circuit problem such as a short-circuit, open circuit, or connector failure rather than an actual temperature extreme. The first step is to inspect connector CN30 and measure resistance between pins 4 and 5.

Short-term use is possible, but the refrigerator may not be completing proper defrost cycles, which can lead to frost buildup on the evaporator and reduced cooling performance over time. Food safety could be affected if temperatures in the compartment begin to rise. It is best to address the error promptly to avoid secondary problems.

A power reset may temporarily clear the error code from the display, but the code will return if the underlying fault in the sensor circuit has not been corrected. Resetting without addressing the root cause, such as a faulty connector, damaged wiring, or failed sensor, does not fix the problem. Always diagnose and repair the circuit fault before relying on a reset.

A knowledgeable DIYer can attempt this repair by checking the connector at CN30 for corrosion, loose contacts, or visible wiring damage. If the connector and wiring appear intact, replacing the defrost sensor is a relatively straightforward part swap. However, if you are not comfortable measuring resistance with a multimeter or accessing internal refrigerator components, a qualified technician is recommended.

If only the connector needs cleaning or reseating, the repair may cost little to nothing in parts. A replacement defrost sensor typically runs in the range of $15 to $50 for the part alone. If a technician is needed for diagnosis and labor, total repair costs commonly fall in the range of $100 to $250 depending on your location and service provider.