LG Refrigerator Error Code E r2

The Er2 code indicates a problem with the second refrigerator compartment temperature sensor. The control board has detected that the sensor is producing a reading consistent with a short circuit, an open circuit, or a resistance value outside the expected range. This prevents the refrigerator from accurately monitoring and controlling its internal temperature. The issue may be with the sensor itself, its wiring, or the connector at the main PCB.

A faulty temperature sensor means the refrigerator may not maintain accurate or consistent temperatures inside the fresh food compartment. Using the appliance in this condition puts perishable food at risk of spoilage or unsafe temperatures. It is best to address the error promptly, and in the meantime check the actual internal temperature with a separate thermometer to assess whether food is being kept at a safe level below 40 degrees Fahrenheit.

If the fix is simply reseating a loose connector, there is no parts cost and the repair can be done without a technician. Replacing a faulty thermistor sensor is generally an inexpensive repair, with parts typically ranging from $15 to $50 depending on the specific model. If the main PCB requires replacement, costs rise considerably, often falling in the range of $150 to $400 or more for parts and labor combined.

Start by checking the connector at CON7 pins 17 and 18 on the main PCB, as a loose or corroded connection is the most common cause. If reseating the connector does not clear the error, use a multimeter to test the resistance of the thermistor and inspect the wiring harness for damage. If the sensor resistance is out of range, the thermistor will need to be replaced. In rare cases, the main PCB itself may need to be replaced if the sensor and wiring both test correctly.

A power reset, such as unplugging the unit for a few minutes, may temporarily clear the code if the cause was a transient electrical issue or a momentarily loose connection. However, if the underlying problem with the sensor, wiring, or connector persists, the code will return once the control board completes its diagnostic cycle. A reset is a useful first step but is not a repair on its own.