What will cause a fire alarm to go off without a fire?
Smoke. Mine goes off when I cook bacon :)
Put new batteries in it
People that can't cook or in school a goon pulling the alarm for the hell of it.
tobacco smoke :)
at skool they put a date on it and den it go off
Could be it's defective. Is it actually sounding or just chirping every minute or so?
Have you ever cleaned it?
someone setting it off
Make sure it's not a carbon monoxide detector.
mine went off one time when a spider spun a web inside it. (darn stupid spiders)
Oooooh MY GOD DUDE!!! I wanted to say Penny farting would set it off, but I thought youd get mad!!! Dang! I missed my chance! So yeah, try cleaning it, maybe with a vacuum. And check the batteries. On the smoke detector, not Penny's butt.
Maybe smoke, when you are cooking. And, once a year someone has to test it, to see if it works, so maybe it was that. :)