Things You'll Need
A doorbell provides a means for a person to announce his presence at your front door. Often a doorbell is more audible throughout a home than a knock is. If the doorbell stops functioning correctly, one problem may be that the diode is damaged. The diode is a component that allows the doorbell to continue ringing after the button has been released.
Turn off the power to the circuit at the main electrical box.
Unscrew the mounting screws that keep the doorbell mounted to the house.
Pull the doorbell away from the house, and test the wires with a voltage tester. If you get a reading, switch off a different circuit and test the line again. Proceed to Step 4 only after you have shut off the circuit that controls the doorbell.
Loosen the terminal screws on the diode, and remove the wires. The diode is the flat plate behind the doorbell. Remove the diode and replace it with a new one.
Wrap the wire leading from the transformer around one of the terminal screws on the diode, and tighten the screw.
Wrap the wire leading to the doorbell button to the other terminal screw, and tighten the screw. The diode is now installed in the circuit.
Screw the doorbell back into place.
Restore power to the circuit, and test the doorbell.