LG · Microwave error code
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Guide · MicrowaveSensor programs depend on a humidity or vapor sensor and a correct load. Most failures are usage (tight covers, tiny loads, hot cavity) or grease on the sensor; a failed sensor or wiring shows a code.
Guide · MicrowaveRule out user settings first (control lock, demo mode, Start not pressed, shipping spacer). If those are fine, the control is not seeing a closed door or is not driving its relays: door switches, latch, or control board.
Guide · MicrowaveRule out the outlet and breaker/GFCI first. Inside, the usual cause is a blown line (main) fuse, often blown on purpose by the monitor switch when a door switch fails, so test the door switches before replacing the fuse. Thermal cutoffs and the control board are next. Internal work is high voltage: trained techs only.
LG · Microwave
F2
Thermistor out of range
LG · Microwave
F3
Control panel / shorted key
LG · Microwave
F5
Damper switch error (per LG)
LG · Microwave
F11
Inverter communication error
LG · Microwave
SE
Key short error