GE Refrigerator Error Code DEFROST SENSOR OF R ROOM

This error means the main control board has detected a problem with the defrost sensor located in the refrigerator compartment. The fault is triggered when the sensor reads a temperature above 122°F or below -58°F, or when the circuit shows an open or short condition. It can also be caused by a loose or corroded connector in the sensor wiring harness. The error affects the automatic defrost cycle and should be diagnosed promptly to prevent frost buildup and cooling loss.

Short-term use is generally possible, but a failed defrost sensor can cause frost to accumulate on the evaporator coil over time, eventually blocking airflow and reducing cooling performance. If your refrigerator is already not cooling properly, food safety becomes a concern and the unit should not be relied upon until the fault is resolved. It is best to address the error as soon as possible to avoid further damage to the sealed system.

A power reset may temporarily clear the error code from the display, but the fault will return if the underlying problem is not corrected. The main PCB monitors the sensor continuously, and any reading outside the valid voltage range of 1.0V to 4.5V will trigger the code again. A reset is useful for confirming whether a fault is intermittent or persistent, but it is not a fix. The sensor circuit and wiring must be inspected and repaired to permanently resolve the error.

A knowledgeable DIYer can perform the initial diagnostics by checking the voltage at the main PCB sensor connector, which should fall between 1.0V and 4.5V. Inspecting and reseating the wiring harness connectors is also a reasonable first step that requires no special tools. If the sensor itself needs replacement, the repair involves accessing the evaporator compartment and is manageable for someone comfortable with appliance work. If the fault points to the main PCB, professional service is recommended.

If the repair only requires a new defrost sensor, parts typically cost in the range of $15 to $60 depending on the model. Professional labor to diagnose and replace the sensor generally adds $75 to $200. If the main PCB is the root cause, board replacement parts can range from $100 to $350 or more, with additional labor costs. Connector or wiring repairs are usually the least expensive option if that is the only failure.