Why does my smoke alarm go off for no reason?

Answer

Smoke detectors that sound when smoke is not present may suffer from an electrical problem. The smoke sensor may be at fault as well. Some sound if the battery is low and needs replacement.

Smoke detectors are essential safety devices, and they have saved many lives through the years. When they sound when smoke is not present, however, they can become a nuisance. While smoke detectors have robust electrical wiring, their wiring may short-circuit or otherwise break. On occasion, faulty wiring can cause the detector to sound in the absence of smoke.

Smoke detectors are sensitive, and they require only a small amount of smoke to trigger. Because of their sensitivity, smoke detector sensors might react to the movement of air, dust or other factors. Because smoke detectors contain highly radioactive elements, those with fault sensors may need to be replaced.

Smoke detectors may beep if their batteries are running low, but many people interpret this as the smoke detector malfunctioning. If the beeping is only occasional, replacing the battery is likely to fix the problem. However, owners may wish to check the smoke detector's manual first; occasional beeping can also be caused by a malfunction, and it may not work properly if there is a fire.

Q&A Related to "Why does my smoke alarm go off for no reason?"
Steam and vapor from cooking food can set off the alarm. If your smoke alarm is located close to air heating systems, air blowing from the unit can set off the alarm. Steam from showers
http://www.ehow.com/facts_7900522_do-alarms-go-off...
it could be the electrical wiring or the batteries are low
http://wiki.answers.com/Q/Why_would_a_smoke_alarm_...
1. Get out of the residence immediately even if you don't see any fire or see or smell any smoke. Do not check to see what is going on. 2. Call the fire department from a neighbor's
http://www.wikihow.com/React-if-Your-Smoke-Alarm-G...
Maybe you only thought they went off. Maybe the sound was actually coming from inside your ear. That's a common condition called tinnitus. Another possibility is that they were trying
http://answers.yahoo.com/question/index?qid=201001...
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