LG Refrigerator Error Code Er r1

Er r1 indicates that the control board has detected a short circuit or open circuit in Refrigerator Sensor 1, the temperature thermistor located in the upper part of the refrigerator compartment. The board cannot get a valid resistance reading from the sensor, so it cannot accurately monitor compartment temperature. This may result in improper cooling or the refrigerator running abnormally.

A reset may temporarily clear the display, but the code will return if the underlying fault in the sensor circuit has not been resolved. The control board will detect the short or open circuit again as soon as it runs its next diagnostic check. The root cause, whether a loose connector, failed thermistor, or damaged wiring, must be corrected for the error to stay cleared.

If only a loose connection needs to be reseated, there may be no parts cost at all, with only a service call fee if a technician is involved, typically in the range of $75 to $150. A replacement thermistor sensor is generally an inexpensive part, often in the $15 to $50 range, with labor adding $100 to $200 if professionally installed. If the main control board is at fault, total repair costs could range from $200 to $450 or more depending on the specific board and labor rates in your area.

In many cases, yes. Start by checking the wiring connector at CON9 for a loose or unseated connection, which is a straightforward fix that requires no parts. If the connection is secure, you can test the resistance of the White to White wires on the sensor circuit to determine if the thermistor has failed. Replacing a thermistor is a moderate DIY repair, though working near refrigerant lines requires caution.

It is not recommended to rely on the refrigerator for extended periods while this error is active. Without a valid reading from the upper compartment sensor, the control board cannot properly regulate temperature, which means food safety could be compromised. Check the actual temperature inside the compartment with a separate thermometer and address the fault as soon as possible.