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If your doorbell is relentlessly buzzing or humming, the button may be stuck in the contact position. If this continues for very long, the electromagnet will burn out and the bell unit won't work even if current is being delivered to it through the button.
You will need to immediately disconnect the button from the wires and repair or replace the button. Otherwise the bell unit will wear out and you will have to replace it. For instructions on disassembling a doorbell button, see Repairing a Doorbell That Makes No Sound.
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