How to Fix a Doorbell

You’ll find most doorbell transformers near the main electrical panel. Set the multimeter to voltage setting, and place its probes on the screws where the small-gauge doorbell wires are attached. If the multimeter reads 16 volts or so, the transformer is fine; go to Step 5. If it’s producing less than 16 volts, call an electrician to replace the transformer; this involves working with 120-volt wires and following the electrical code.