Written by
Marcus Lindqvist Appliance Care EditorPublished October 26, 2026
VERIFIED
Error codeF3
ApplianceMicrowave
How LG microwave errors read
Errors on these microwaves begin with an F and a number on the display. F3 is traced by the manufacturer to foreign substances sitting around the touch button panel.
Two things to do
Remove anything foreign from the touch button panel and check the display again.
Still showing F3? Unplug the electrical cord, plug it back in, and see whether the same error comes back.
If the code returns
A one-off glitch can produce these symptoms. If they carry on, the manual asks for an inspection so the cause is diagnosed accurately. Different F codes can stem from failed components, shorting, faulty communication or excess current, and those are jobs for a service technician.
Microwave service in San Francisco
San Francisco and Bay Area owners can phone (415) 223-7887 about LG microwave repair. Please be ready with the model number, the code on the display, and the fact that you wiped the panel and replugged the cord.
Model compatibility: LG reuses codes across series and model years, so F3 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
F3 can occur on an LG microwave when foreign substances are around the touch button panel.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your LG appliance?
Book a specialist visit for a clear estimate and approval before any repair.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
Service areas are listed on the Locations page. Contact us with your ZIP code to confirm current coverage for your address.
Ready to get your LG appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
