LG Refrigerator Error Code Freezer Room Sensor Error

This error indicates that the control board has detected a problem with the temperature sensor circuit in the freezer compartment. The sensor signal voltage at the main PCB should fall between 1.0V and 4.5V during normal operation, and any reading outside that range triggers the fault. The issue can stem from a defective thermistor, damaged wiring, or a connector problem. Until the sensor circuit is repaired, the refrigerator may not regulate freezer temperatures correctly.

If the freezer is still running and feels cold, food may remain safe in the short term, but you cannot rely on the appliance to maintain proper freezing temperatures without an accurate sensor signal. The control board cannot make correct decisions about compressor and fan operation without good temperature data. Check that the freezer feels adequately cold and monitor closely, but arrange for repair as soon as possible to avoid food spoilage.

A reset may temporarily clear the error code from the display, but the fault will return if the underlying problem in the sensor circuit has not been corrected. Resetting is useful to confirm whether the error was a transient glitch, such as a briefly loose connector, but it is not a repair. If the code returns after a reset, a proper electrical diagnosis of the sensor wiring and thermistor is required.

A knowledgeable DIYer comfortable with basic electrical testing can check the wiring harness and connectors for visible damage or corrosion without specialized tools. Measuring voltage at main PCB connectors CN30 pin 3 and CN76 pin 1 requires a multimeter. If the thermistor itself needs replacement, the part is typically accessible inside the freezer compartment, but working with main PCB connectors requires care to avoid further damage.

If only the thermistor needs replacement, parts typically cost in the range of $15 to $50, and a technician visit would add labor costs on top of that. If the main PCB is the source of the fault, board replacement can range from $100 to $300 or more for the part alone, plus labor. Getting a professional diagnosis first helps avoid replacing components unnecessarily.