About 15 minutes ago, all the smoke alarms in my house went off at the
same time. There was no smoke, fire, dust, or any logical explanation
as to why all the alarms went off, let alone simulataneously.
10 minutes after the alarms went off, they suddenly stopped all. Then
they started up again for a brief minute or two, and after that
The alarms are hardwired, on their own circuit, and have battery
backup. I did not notice any power surges or anything out of the
ordinary that could explain this.
If the batteries were all to fail, the alarms would chirp, not go off.
If the power was to fail or blip, the alarms would make a brief beep.
My first guess is an electrical spike; however the lights did not
flicker or anything. It could be that the smoke detectors were on a
separate phase from the lighting circuit, though.