My wife is complaining that the rear doorbell is not working. Actually it may not have worked when we bought the house 12 years ago, so I can't imagine why it matters now, but that's another story.
The chime has three terminals on it. A white wire goes to "front", a red to "transformer" and a black to "rear". The panel has two transformers on it, each putting out 20vac to sets of white and red wires. Each switch (or whatever the pushbutton is called) has a red and white wire on it. There is 20vac at each switch.
The rear doorbell does not chime when I short the switch.
I cannot figure out:
1) where the black wire at the chime comes from, when there isn't a black wire at either switch or transformer 2) why I have two transformers when seemingly only one is needed for the system 3) why the rear chime doesn't work when there is voltage at the switch and the front chime worksAny idea what is going on here? Is there any other use for a 20vac transformer but a doorbell? (The wires from the transformers get lost in the walls, but one goes to the middle of the house by the front door and the other goes to the far end of the house by the rear door.)