Hi. I’ve just tried all of the above. With regards to the ring doorbell, I’ve removed it and charged it overnight. I’ve checked the wiring and all is ok, even as I was unscrewing and screwing the golf screws which the two wires connect to on the backplate, the original doorbell box was ringing so this shows the wires are still live. However, when I fix the doorbell on and tighten the screws and press the ring doorbell button, it rings on the device but no blue light on the push button as there usually is when it’s connected to the mains and the inside bell box doesn’t ring, how can this be when the wires are clearly live and it was ringing as I touched the gold screws on the backplate?
Also, I have tried absolutely everything listed in your answer and on the ring forum etc to make the chime pro work, again, this was working one day and not the next. This stopped working about 4 weeks ago, I’ve just been too busy with work to look at them both. Not happy at all