LG Microwave Error Code E-12

E-12 on an LG microwave indicates a gas sensor short error. The control board has detected that the two terminals of the gas sensor are shorted, meaning there is unintended electrical continuity between them. This could be caused by a failed sensor, a damaged connector, compromised solder joints, or wiring damage. The microwave will not operate normally until the fault is resolved.

No, you should not attempt to use the microwave while E-12 is active. The error indicates a sensor circuit fault, and the appliance may have already disabled itself to prevent operation under this condition. Continuing to attempt operation with a known electrical fault is not advisable, and the underlying short should be diagnosed and corrected first.

Repair costs vary depending on the root cause. If only the sensor connector needs cleaning or a solder joint needs reflow, costs are minimal and mostly involve labor. If the gas sensor itself requires replacement, parts and labor combined typically range from around $80 to $200 or more depending on the model and service rates in your area. In some cases, if the microwave is older, the repair cost may approach the price of a new unit, which is worth factoring into the decision.

Some aspects of this repair are DIY-accessible, such as inspecting and cleaning the sensor connector or checking for visibly damaged wiring. However, working inside a microwave involves exposure to high-voltage capacitors that can retain a lethal charge even when unplugged, so the capacitor must be safely discharged before touching any internal components. If the sensor itself has failed and needs replacement, a technician with microwave service experience is recommended.

A simple power reset by unplugging the microwave for a minute or two may temporarily clear the displayed code, but the error will return if the underlying short condition in the sensor circuit is still present. The fault must be physically corrected by repairing or replacing the shorted component before the error will stay clear.