LG lists the MSER1130B as a countertop microwave in its 1.1 cu. ft. class. On this platform, the F3 fault code is one of the more common reasons it gets a service call. LG’s own US product page still carries this model with an active status flag, read 24 September 2026.
Service calls on this microwave most often trace to one of a short list: the F3 fault code, door switch fault preventing the unit from starting at all, or keypad or touch control going unresponsive. We confirm which one applies against the model and serial number before ordering a part.
Key Features
- Turntable-driven even heating
- Electronic touch control with a digital display and clock
- Countertop microwave
- Rated at 1.1 cu. ft.
Most Common Issues on This Model
01
F3 fault code — control fault LG documents specifically for microwaves
02
Door switch fault preventing the unit from starting at all
03
Keypad or touch control going unresponsive