Last updated 2026-08-28
Choosing
The five-minute check before you install
Every item here is free and takes under a minute. Between them they account for most of what goes wrong on the first evening, and all of them are easier to check now than after the old doorbell is off the wall.
Before you open the box
- Photograph the existing doorbell and its wiring before removing anything, including the wires on their terminals
- Find the transformer and read its voltage and VA rating off the label
- Check that rating against the requirement for the exact model you bought
- Identify the chime as mechanical or digital, by listening and then looking
- Confirm the model works with an existing chime at all — some newer ones expect a separate plug-in chime instead
- Check Wi-Fi at the door, not on the porch with your phone
- Measure the mounting surface, including how wide the trim is and whether it is flat
- Find the breaker that feeds the doorbell circuit, and confirm it is the right one before you rely on it
If any of those turn up a problem
None of these is a reason to send the camera back. Each has a page here that covers it, and most have a fix costing less than the doorbell did.
The point of checking first is that you get to solve the problem deliberately, with the old doorbell still working, and not at dusk with wires hanging out of the wall.