I have a ADC-VDB770 that had been working fine until recently.
Lately, it will randomly trigger the mechanical chime, which will ring anywhere between 3 times (observed minimum) to an undetermined number of times, at which point I disconnect the chime mechanism out of frustration. I am 100% certain this is happening without anyone being at the door, as I’ve visually verified it several times now. Also, this is happening at various times of the day. At one point, I thought it might be a delayed response to an actual button press from a delivery person. But I doubt that theory now based on the length of time between the chime and the last delivery, and also the number of chimes that are occurring (even the most obnoxious delivery person would not press the button 15+ times). It is as if there’s a ghost that is playing with our doorbell.
The other symptom I had was the doorbell losing power occasionally. I would have to go outside and jiggle it or press it toward the wall to get it to power back up. That was happening before the random chiming. However, now that the random chiming has started, I don’t seem to be getting the power down events anymore (or at least haven’t in a while).
Any theories on this before I start tinkering with anything? Thanks for your help.