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BRK Electronics Smoke/Carbon Monoxide Detector 4120SB

Smoke Detector Gone Wild?!
Posted by kerry.clark on Jul 15th, 2008 at 9:52pm

My smoke alarm started chirping loudly - once per minute which seems to signify a need for a new battery which I replaced. The detector continues to chirp once per minute anyway. In fact, the detector chirps even without a 9V in it which seems bizarre...?

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  • Same problem
    Posted by msapub on Oct 5th, 2008 at 10:06am

    We've had the same problem over the last 4 years. I don't know how to fix it. We've tried replacing the battery with different brands. We've tried leaving the battery and power disconnected for weeks at a time. Nothing seems to reliably stop these things from chirping. I HATE these stupid BRK 4120SB 's.

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