LG Microwave F-11 Error Code - Inverter Output / Magnetron Fault

What Caused This Error?

The control system reports F-11 when the monitored condition described by the error code is outside the expected operating range. In this case, the most likely trigger is failed inverter pcb module. Other common contributors include open magnetron tube filament and defective high-voltage harness.

Step-by-Step Diagnostic Check

1. Unplug unit and safely discharge high voltage capacitor before working.
2. Disconnect electrical power before opening panels. Test magnetron filament terminals for continuity (~0 ohms).
3. Check magnetron metal terminals to ground (should read infinite ohms).
4. Disconnect electrical power before opening panels. Replace inverter power board module or magnetron.