Why does my fire alarm go off when there is no smoke?
Why does my fire alarm go off when there is no smoke? The most likely reason smoke detectors go off unexpectedly is that people aren't changing the batteries in them often enough. In most sensors you might think of, the strength of the signal goes up when they detect what they're supposed to. That's because smoke in the air will reduce the current. What to do if fire alarm goes off for no reason? If the reset button doesn't do the trick, take the alarm down and remove the batteries. If your smoke detector has a long-life lithium battery that...