Just taking a flying guess but you should read the instructions for the best answer. Mains operated linked smoke alarms need to operate as normal when the power goes off, a common occurrence in a fire, so the ones my friend has also have internal batteries that need replacing periodically.
Beeping when the power is off might be normal or might be a call for some replacement batteries.
SOURCE: how to stop dicon smoke alarm beeping
All smoke alarms beep if the battery is too low. Getting a used battery isn't good enough for smoke alarms. Even getting a new battery from a dollar store (a cheap no name brand import store) will not do... it has to be the newest and it has to be alkaline. once you put it in... press the button for 10 seconds... first you will hear it's own alarm then you will hear the others attached to it in the whole system chime in (if you have that type) the alarm will now sit quietly.
SOURCE: does kiddie 1275 smoke alarms
No,this thing a smoke alarm detectors,damp air doesn't set it off.
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