We live in a housing development built in 2000 with interconnected smoke detectors powered by AC with battery backup... there are 10 in the house. They are all going off right now (in a neighbors house) and if we cut the AC they stop for a couple of minutes and then trigger again on battery. I guess one has malfunctioned... how can I get them to stop other than disconnecting them until I find the defective one?

We took them all out, then reinstalled them one at a time... when the defective one was installed it malfunctioned. Problem solved.

Just saw the Post, When one goes into Alarm, The Red led should show the one that triggered.

OK... I'll remember that... thanks!