LG · Microwave
F-3
Stuck keypad button
What causes it
The membrane keypad has detected a button that isn't springing back up, often from trapped moisture or a worn membrane.
What it means in practice
The membrane keypad detected a button that is not springing back, often from moisture or wear.
What to check before calling
- ✓Unplug the microwave for 5 minutes, then press each button to feel for one that stays down or feels different from the rest.
- ✓Wipe the keypad area dry and let it air out before plugging back in — if F-3 returns, the keypad assembly needs replacing.
- ✓Unplug the microwave and wipe the keypad with a slightly damp cloth.
- ✓Press each button firmly to find any that stick.
When to call a technician
If F-3 stays, the keypad needs replacing.
If those checks don't clear the F-3 code, it's usually a sign of a failed part rather than something to keep resetting. A technician runs a full diagnostic on your microwave, confirms the cause, and quotes the repair before any work starts. The $89 service call is waived if you go ahead with the repair, and parts and labor are covered by our 90-day warranty on parts & labor.
Common question
Will it fix itself?
Sometimes drying out clears it, but a worn keypad won't recover.
Still showing F-3?
Same-day diagnosis and repair across Las Vegas, Henderson, and Summerlin. $89 service call, waived with repair.
Other Microwave Error Codes
Not seeing F-3, or want to compare it against a different code on the display? Here's what these other common microwave codes mean.