On Sat, 08 Jun 2019 09:03:30 +0100, Harry Bloomfield wrote:

charles laid this down on his screen :
mmm. But if the power failure has caused the garage circuit breaker to
trip - then what?

Not just that, but my processor run door control has crashed a few times
since I installed it. I have a keypad protected small door as well, but
that also uses a processor and has crashed a few times. Not such a
problem I can gain entry to the later via a normal mechanical Yale key
as backup.

Same here. SWMBO was worried until I pointed out that the key still
worked.

Ours is run from the VoIP PBX, and opens either via an internal phone or
a 2FA call from a mobile phone.

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