Quote:
Originally Posted by fraurose
Check for moisture in the ceiling . This happen to me , when I took the Fire alarm down you could see there was A spot where there was moisture. It keep doing it even after I replaced with new ones, I finally left the battery out and unplugged the electric part close it up again and bought one you can put in an outlet on any wall. perfect now no more problems .
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I have never heard of a smoke detector that plugs into a wall outlet. The building code requires all smoke detectors to be interconnected with a low voltage electrical system, and each detector must have a battery for backup power. The only type of stand alone detectors allowed are 10-year detectors that have a permanent, sealed battery.