Hard Wired Smoke Alarm Acting Very Strange


Old 02-22-10, 06:27 PM
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Question Hard Wired Smoke Alarm Acting Very Strange

Hello all. I just joined the forum tonight and hope someone might have a plausible answer for a strange event that happened tonight.
In our finished attic space (currently used as a studio) there was once installed a hard wired smoke alarm. Two years ago it was knocked from its post on the ceiling and there now resides simply the wires hanging from the spot where once the alarm rested. I know I should have replaced it immediately, but it fell far down my list and tonight while working in the studio, I heard a loud repetitious beeping as if the alarm had been activated. The beeping alarm was constant (although the noise level did fluctuate slightly) and lasted for nearly five minutes before going quiet and then shutting down. My question is about the alarm - can a hard wired smoke alarm go off without the alarm box (including battery) attached?
I found no fire, no smoke, no heat and all circuit breakers were fine. Any clues? Many thanks - brian
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Old 02-22-10, 06:37 PM
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The pros will weigh in...but here goes.

Is the detector still in the studio? Is it possible that it activated on battery power (a/c detector with battery back-up) while just sitting on a shelf? Could be it picked up some dust or it was the battery's last hurrah.

Are you sure the alarm sound was from the studio and not the rest of the house?
Old 02-22-10, 07:57 PM
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how old this smoke detector is ?

If pretty close to 10 years then it is good time to replace it.

Most common false alarm is dust or bugs get inside the smoke decetors.

Merci, Marc

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