If you have a hard-wired doorbell and it stops working, chances are there is a loose or broken wire in the button itself. Whether you are making repairs or replacing the unit all together, it is necessary to remove the existing button. Removing a doorbell button is a straightforward process. Doorbells attach simply to a home, although the securing screws might be hidden. Replacement doorbell buttons and doorbell systems are available at home improvement centers.
Turn off the power to the doorbell unit if you have a wired door bell. The circuit breaker is in your electrical panel box. Find the correct circuit breaker and turn it off.
Find the screws securing the doorbell to the wall or door jamb. There is a screw above the doorbell button and one below it. If you do not see any screws, slip the blade of a utility knife between the seam of the front and side of the doorbell. Pry the front cover away and access the retaining screws.
Remove the doorbell retaining screws with a Phillips-head screwdriver. Pull the doorbell away from the wall enough so you can access the wires from behind. If you have a wireless doorbell, there are no wires.
Turn the two screws securing the wires to the back of the doorbell counterclockwise with a Phillips-head screwdriver. Remove the doorbell completely from the wall.