Common fault codes for LG microwaves include error codes displayed on the screen that indicate sensor, door, or control failures. The most frequent codes are: F3 or F-3 means humidity sensor or moisture sensor failure, often caused by steam buildup or sensor contamination, requiring sensor replacement. F6 or E6 indicates shorted temperature sensor or thermistor, usually from overheating. E01, E02, E03 relate to door latch or interlock switch failure where microwave thinks door is open and will not start heating, often due to worn door hooks or switches after 3 to 5 years. F10 means touchpad or control panel short, where keys are stuck or moisture entered panel. SE or 5E indicates a shorted keypad error, where a button is stuck down, requiring control panel replacement. LOCK or L is not an error but child lock activated, hold Stop/Clear for 3 seconds to deactivate. PF means power failure, press Clear to reset clock after outage. For LG over-the-range models, E-11 indicates exhaust thermistor failure. Most codes require unplugging microwave for 5 minutes to reset, but if code returns, the faulty sensor, door switch, or control board needs replacement. Always check door closes firmly and clean moisture from sensor area. If microwave sparks or smells burning, unplug immediately and call service.
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