Frigidaire Refrigerator Error Code DEFROST SENSOR OF R ROOM

This error means the main control board has detected a problem with the defrost sensor in the refrigerator compartment. The fault can be caused by an open or short circuit in the sensor, a connector failure, or a temperature reading outside the accepted range of -58°F to 122°F. The board reads a voltage between 1.0V and 4.5V from the sensor under normal conditions, and any reading outside that window triggers the alert.

A defrost sensor fault can prevent the defrost cycle from running correctly, which may lead to frost accumulating on the evaporator over time. Heavy frost buildup will eventually restrict airflow and reduce cooling performance. It is best to address the error promptly to avoid food spoilage or secondary component damage.

A reset may temporarily clear the error code, but if the underlying fault still exists, the error will return once the control board runs its diagnostic check again. Resetting without repairing the sensor, wiring, or connector does not resolve the problem. A permanent fix requires identifying and correcting the root cause before the code will stay cleared.

A knowledgeable DIYer can diagnose this error by checking the sensor connector for corrosion or loose pins and measuring the voltage at the main PCB sensor terminal with a multimeter. If the voltage is outside the 1.0V to 4.5V range, the next step is testing or replacing the thermistor. Wiring repairs and board replacements are more involved and may be better suited to a technician.

If only the thermistor needs replacement, parts typically cost in the range of $15 to $50 depending on the specific model. If a technician is needed for diagnosis and labor, total repair costs generally range from $100 to $250. A main PCB replacement, if required, can push costs higher, typically in the $150 to $400 range for parts and labor combined.