What causes an electric smoke detector to beep?

Answer

Electric smoke detector produces a beeping sound when the battery is low warning that the unit is losing its functionality slowly. This sound is mainly meant to warn the owner to replace the old battery with new ones.
Q&A Related to "What causes an electric smoke detector to beep..."
even though it is hard wire to your electircal you still need to replace the 9 volt battery at least once a year or the chirp and beep will continue they are still battery back up
http://aolanswers.com/questions/diy_5183121219866/
I agree, sounds like a battery problem. Other possibilities: dust, or bad wiring (detector needs to be replaced). See the link below for more details and instructions. Source: http:
https://answers.yahoo.com/question/index?qid=20110...
If your detector is battery operated, it requires a new battery. If mains operated then there is a connection fault - contact an electrician.
http://www.kgbanswers.co.uk/what-should-i-do-about...
Smoke detectors must be present in a home, by law in some states, to keep your family safe by alerting them to the presence of smoke during a fire. Smoke detectors are also supposed
http://www.ehow.co.uk/info_8541348_electric-beepin...
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