faultybutton

noun
UK /ˈfɔːlti ˈbʌtən/
US /ˈfɔːlti ˈbʌtən/

A faulty button is a button that does not work right.

The elevator would not go up because the faulty button was stuck.


OTHER MEANINGS

2. A button that gives the wrong result when pressed.

The faulty button on the toy made it play the wrong song.

3. A button that is loose or falling off.

He sewed the faulty button back onto his shirt.

4. A button that works only sometimes.

The faulty button on the remote only works if you press it hard.