Don Vandervort, Head Homeboy, has written more than 30 DIY home improvement books, been a segment host on HGTV, served as MSN.com's home improvement expert and written countless magazine articles.
If the bell doesn't ring, but the transformer hums when the button is pushed:
1) Check the bell. Be sure the wires are connected to the terminals in the bell unit. If necessary, clean the contacts with fine sandpaper or electrical contact cleaner.
2) Check the piston. It may be worn and jammed inside its sleeve or gummed up if someone has tried to oil it in the past (something you should not do). If this is the case, replace the electromagnetic/piston component or the entire bell unit. 3) Check the wiring. Look for any breaks in the doorbell wiring. If you find one (or more), strip the insulation from the wire ends and splice them with a short piece of matching wire, using properly sized wire nuts.
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