All the smoke alarms started going off at 11:45 PM. They are connected so if one goes off they all do. Pretty sure it was the basement one that set it off because I quickly cut some boards down there in the evening and didn't run the air filter after.
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@dthompson the system I have has the one that triggered subtly flash while all the others stay solid. A test on that one resets. Might be similar for you?
@keverets yeah maybe, I'm usually in too much of a frenzy to notice those details, especially when I am woken up by it.