My friend has a simply wired doorbell. Front door only. The doorbell stopped working after a power outage. Power came back on - no doorbell. I checked all the wiring - doorbell at the front door to chime box to the transformer. Visually, nothing wrong. I checked the transformer. My voltage meter registers it at 12v. The transformer says 16VAC on it. Zero voltage on the chime box and doorbell.
Here's what I've done to troubleshoot:
Remove the doorbell button and touch both wires together. No ring. Tried a new doorbell button - no ring Replaced the chime box - no ring Replaced the transformer - no ring. The new transformer registered at 12 volts too. Both the old and new transformer - the wires into the house - that's 120v and looks good.
At my house, my doorbell works. When I test my transformer, it comes back to 12v too. My volt tester tells me 12v, 24v, etc. It doesn't have a 16v on it.
So what could be going on here? It could be a break in one of the wires, but I don't have the tools to test for that, nor the room to crawl in the attic and find the wires and visually trace them. I wouldn't even know where to begin on that.
Any other troubleshooting steps I can take?