Fixing a doorbell that fails to ring requires isolating whether the fault lies in the push button, the transformer, or the indoor chime box. For a wired system, start by removing the outdoor push button and touching its low-voltage wires together; if the indoor chime sounds, the push button is faulty. If it does not sound, use a digital multimeter set to alternating current to test the transformer output terminals for 16 to 24 volts AC. For a smart wireless doorbell, check battery charge levels and app notifications. You can troubleshoot doorbell circuits safely by turning off power before handling wires. You can verify that your corrective action is successful when replacing a broken push button, installing a new transformer, or recharging the battery restores normal ringing functionality.
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