GE Refrigerator Error Code R2 R3 R4 R5 (pattern 2)

The R2, R3, R4, and R5 error codes in pattern 2 on GE refrigerators indicate that the control board has detected an open or short circuit condition in one or more of the defrost sensors. These sensors are thermistors that monitor temperatures at critical points in the defrost system, such as the evaporator coil and defrost heater assembly. The control board continuously reads resistance values from these sensors, and when a reading falls outside the expected range, either too high (open circuit) or too low (short circuit), the corresponding error code is triggered.

An open circuit in a defrost sensor typically results from a broken wire, a failed thermistor element, or a corroded connector, all of which prevent the circuit from completing. A short circuit, on the other hand, occurs when the sensor wiring contacts ground or another conductor unintentionally, driving resistance down to near zero. Both conditions render the sensor unable to provide accurate temperature data, which can cause the defrost system to behave erratically, run continuously, or fail to initiate at all.

Diagnosing this fault begins with physically inspecting each sensor identified by the active code. Check for visible wire damage, ice or moisture intrusion at connectors, and corrosion at the harness terminals. Resistance testing with a multimeter at the sensor leads will confirm whether the thermistor itself has failed or whether the fault lies in the wiring harness. A healthy thermistor will show a resistance value consistent with ambient temperature rather than an infinite or near-zero reading.