LG · Microwave
F3 error-code guide
LG says an F3 error on applicable lightwave ovens can occur when foreign substances are around the touch-button panel.
Read the guideCurrent LG microwave coverage
Published LG microwave guides
This hub contains 2 published guides for select LG microwave error codes. Coverage is intentionally limited and does not include all codes or models.
Microwave runs but food stays cold? Use the microwave not-heating symptom guide.
Microwave will not begin a cook cycle? Use the microwave won’t-start symptom guide.
Seeing sparks or arcing instead of a code? Use the microwave arcing safety guide.
Source-backed guides
Choose the code shown on the appliance
Each card links to a guide that separates the detected condition from possible causes, preliminary checks, limitations, and service boundaries.
LG · Microwave
L / Loc error-code guide
LG documents L, Loc, or a lock icon as an indication that Child Lock or Control Lock is enabled on applicable models.
Read the guideHow to use this collection
Sources, context, and safety remain part of every guide
Documented context
Each guide identifies the manufacturer support material reviewed and explains where that material has model or applicability limits.
Clear safety boundaries
Homeowner observations remain separate from disassembly, electrical work, internal testing, and other work that belongs with a qualified professional.
Appliance Help HQ is an independent informational site and is not affiliated with or endorsed by LG.