Symptoms
- Display shows a lock icon or 'Loc' message
- Buttons don't respond to normal use
- Lock may have been engaged accidentally by a child or during cleaning
- Microwave otherwise seems to power on normally
Likely causes
- CommonControl lock feature intentionally or accidentally engagedMost microwaves include a child-safety lock, often engaged by holding a specific button.
- CommonWrong button or hold duration attempted for unlockingUnlock sequences differ significantly across brands and models.
- Less commonControl board glitch keeping the lock engagedRarely, a reset is needed to clear a stuck lock state.
What to do
- Look for a 'Lock,' 'Child Lock,' or padlock icon button on your specific model.
- Press and hold that button for the duration specified in your manual, often around 3 seconds, since a quick tap usually won't release it.
- Watch the display for the lock icon or message to clear.
- If you don't have the manual, search your exact model number online for the specific unlock steps.
- If the correct button and hold time doesn't work, unplug the microwave for about a minute and try again after restoring power.
- If the lock still won't release after a proper attempt and a power reset, the control board may need professional service.
When to call a pro
If the correct unlock sequence and a power reset don't clear it, an appliance technician can check the control board.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.