ErrorCodeDoctor
LG Microwave F3 error code
The F3 error means your LG microwave has detected a problem with the control panel. The control panel is how you interact with and program the microwave — when it develops a fault the unit cannot accept inputs or operate normally. There are no user steps to resolve this error and the unit requires a professional repair service to inspect and replace the faulty control panel.
Common causes
- Control panel has malfunctioned or failed
- Internal fault detected in the control panel circuitry
- Wiring between the control panel and main board is loose or damaged
How to fix it
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1
Disconnect the microwave from power for about a minute and plug it back in to attempt a reset
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2
If F3 returns after resetting the control panel needs inspection and replacement by a qualified technician
Related LG Microwave error codes
F3 error — frequently asked questions
What does the F3 error mean on a LG microwave?
A fault was detected in the control panel
What causes the F3 error?
The F3 error is usually caused by: Control panel has malfunctioned or failed; Internal fault detected in the control panel circuitry; Wiring between the control panel and main board is loose or damaged.
Can I fix the F3 error myself?
This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.
How much does it cost to fix the F3 error?
Fixing the F3 error on a LG microwave typically costs $100–$300, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my microwave with the F3 error?
We'd recommend addressing the F3 error before continuing to use the microwave, since hard-rated issues often involve a real fault rather than a minor glitch.