OK, so I’ve received the replacement Home Base 2. I went through the setup process step by step, documenting the results after each step. I fully expected that the new unit would demonstrate the same fault, rapidly and audibly clicking away to itself so I wanted to be specific about when it started.
So I’m happy to report that (so far) I’m not hearing any clicking from the Home Base. The doorbell itself is now fixed to the wall outside, so we’re up and running. I hope it lasts.
The green light by the ethernet port was initially flashing rapidly and constantly (as on the old unit), but I’ve looked again just now and it seems to have settled down. It flashes occasionally but not as incessantly as before.
I’m not really sure what the green light indicates. It looks like it must be data activity rather than just a connection. If so, maybe the unit is polling the network for events and that’s what causes the occasional flashing. But that’s sheer guesswork.
So I’m hopeful that it’s going to be OK now, but I’ll obviously be monitoring it closely.