ErrorCodeDoctor
LG Microwave F1 error code
The F1 error means your LG microwave has detected a problem with the main control board. The main board controls all functions of the microwave — when it develops a fault the unit cannot operate safely. There are no user steps to resolve this error and the unit requires a professional repair service to inspect and replace the faulty main board.
Common causes
- Main control board has malfunctioned or failed
- Internal fault detected on the main board circuitry
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 F1 returns after resetting the main control board needs inspection and replacement by a qualified technician
Related LG Microwave error codes
F1 error — frequently asked questions
What does the F1 error mean on a LG microwave?
A fault was detected in the main control board
What causes the F1 error?
The F1 error is usually caused by: Main control board has malfunctioned or failed; Internal fault detected on the main board circuitry.
Can I fix the F1 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 F1 error?
Fixing the F1 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 F1 error?
We'd recommend addressing the F1 error before continuing to use the microwave, since hard-rated issues often involve a real fault rather than a minor glitch.