LG Refrigerator Error Code Er 3

Er 3 indicates an abnormal signal from refrigerator sensor 2, the temperature sensor located in the middle section of the fresh food compartment. The control board has detected either a short circuit (resistance too low) or an open circuit (resistance too high) from this sensor. The fault prevents the board from accurately monitoring and controlling the temperature in that zone.

A power reset may temporarily clear the Er 3 code, but the fault will return if the underlying problem with sensor 2 or its wiring has not been corrected. Resetting is useful for confirming whether the error is intermittent, but it is not a repair. Proper diagnosis with a multimeter is necessary to resolve the issue permanently.

If only the thermistor sensor needs replacement, parts typically cost between $10 and $40, and the repair is often straightforward for someone comfortable with basic appliance work. If professional labor is needed, total repair costs generally range from $75 to $200 depending on the technician and the extent of the wiring or component work required. Control board replacement, if needed, would increase that range significantly.

Start by using a multimeter to check the resistance of refrigerator sensor 2. If the reading is near zero or shows no continuity, the sensor or its wiring is faulty. Inspect the connector for corrosion or looseness and replace the sensor or repair the harness as needed. If the sensor and wiring test normal, the control board may require further evaluation.

Operating the refrigerator with an Er 3 fault carries some risk, as the control board cannot accurately monitor the middle compartment temperature without a working sensor. Food safety could be compromised if the unit is not cooling properly. It is advisable to check food temperatures and address the fault as soon as possible.