LG
All LG Microwave Error Codes
Every known LG microwave error code with plain-English explanations, difficulty ratings, and step-by-step DIY fix guides.
15 error codes
F-1
The humidity sensor used for auto-cook modes has failed.
Easy Fix
15–30 minutes
F-2
The oven cavity temperature sensor (thermistor) is reading abnormally.
Moderate Fix
20–40 minutes
F-3
A key on the microwave touchpad is shorted or stuck.
Moderate Fix
15–40 minutes
F-5
The humidity sensor circuit is open (no connection).
Moderate Fix
20–40 minutes
F-7
The microwave door sensing switch is not working properly.
Moderate Fix
20–40 minutes
F-9
The microwave's EEPROM memory chip cannot be read or written.
Advanced Fix
20–40 minutes
E10
The control board detected an internal short circuit.
Advanced Fix
10–30 minutes
F-4
The humidity sensor is not functioning correctly.
Advanced Fix
N/A (professional repair needed)
F-11
The control board and inverter board have lost communication.
Advanced Fix
N/A (professional repair needed)
F-13
The microwave has detected a voltage problem in the inverter circuit.
Advanced Fix
N/A (professional repair needed)
F-16
The microwave detected a heating abnormality.
Advanced Fix
N/A (professional repair needed)
F-17
The internal temperature sensor is malfunctioning.
Advanced Fix
N/A (professional repair needed)
F-19
A secondary heating issue was detected by the control board.
Advanced Fix
N/A (professional repair needed)
DOOR
The microwave door is not fully closed or the door latch is not engaged.
Easy Fix
5–10 minutes
LOC
The control lock feature is activated, preventing all button presses.
Easy Fix
1 minute