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.