Door bells are a convenient tool for announcing someone as arrived at your door. Depending on the chime, there are often different sounds for different doors to differentiate from one door to the other. When someone gets to your door they either knock or push a button to ring your door bell. When the button is pushed, it completes the door bell circuit and rings the bell. But what if the bell doesn't ring? What could possibly be wrong? Could it be operator error? Well maybe, but I would say it is a problem in the switch, wiring or the door bell itself. To find out for sure, you'll need to perform these door bell troubleshooting tips.
...Source: http://electrical.about.com/b/2014/04/14/for-whom-the-bell-tolls-or-not.htm
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