Cooking smoke, steam, dusty air, and even bugs can cause false alarms. Consider moving your smoke detector if you are getting regular false alarms from cooking smoke or shower steam. If you are experiencing false alarms for an unknown reason, try cleaning your smoke detector by dusting the exterior and gently vacuuming over the sensor vent holes. ALL YOUR ALARMS will sound during a false alarm, but typically ONLY ONE alarm triggered the alert. You can identify the culprit by locating the alarm with the flashing red indicator light. Clean and clear out this alarm first.