LG Refrigerator Error Code R2 sensor

The R2 sensor error on an LG refrigerator indicates an abnormal condition in the secondary refrigerator temperature sensor, also referred to as the mid-room sensor. This sensor monitors the internal temperature at a middle position within the fresh food compartment, giving the control board a secondary reference point for thermal regulation. When the control board detects either a short circuit (resistance reading near zero ohms) or an open circuit (infinite resistance) from this sensor, it logs the R2 fault and may impair the refrigerator's ability to maintain accurate compartment temperatures.

The sensor itself is a negative temperature coefficient (NTC) thermistor, meaning its resistance decreases predictably as temperature rises. A healthy sensor should produce a measurable resistance value within a specified range depending on compartment temperature. The primary diagnostic entry point is connector CON7, where the sensor's gray wires terminate. A loose, corroded, or improperly seated connector at CON7 is a frequent culprit and should be inspected and firmly reseated before any other steps are taken. With the connector unplugged, measuring resistance directly across the gray wires confirms whether the sensor itself has failed or whether the issue lies in the wiring harness.

If the connector is secure and the resistance reading is either at zero ohms or shows no continuity at all, the thermistor has likely failed internally and requires replacement. Wiring harness damage, such as pinched or chafed wire insulation along the routing path between the sensor and the control board, can also produce these readings and should be inspected carefully. In some cases, moisture intrusion into the connector or sensor housing causes intermittent faults that may not appear consistently during testing.