When an indoor doorbell chime box fails to receive electrical power, it typically points to a failure in the low-voltage circuit connecting the transformer, push button, and chime unit. The most frequent cause is a burnt-out doorbell transformer mounted near your electrical service panel or utility room, which steps down 120-volt household power to 16 to 24 volts AC; if its internal thermal fuse blows, output drops to zero. Other common causes include loose wire terminal screw connections inside the chime box or transformer, or a severed low-voltage wire running through the wall. You can troubleshoot low-voltage power safely by using a digital multimeter set to AC voltage to test the transformer output terminals. You can verify that your corrective action is successful when securing loose terminal connections or replacing a dead transformer restores steady 16 to 24 volts AC to the doorbell chime.
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