Its probably a bad detector. You could try vacuuming it, sometimes dust in
the unit can cause false alarms, but I'd just replace it
"Jerr" wrote in message
...
I have six Firex AD smoke alarms hardwired in my house. They also have
battery backup. I know that when the unit emits a low beep every minute
the battery is weak. I have a situation where one of the alarms sounds
loudly for 10 to 15 seconds and sometimes setting another unit off. There
is definitely no smoke setting it off. What can it be?