Your smoke detector can go off even if there's no smoke. The question then is: why does my smoke alarm go off when there's no smoke? We will help you by offering you a few possible explanations.
The smoke detector is standing/hanging in a bad place
Install the smoke alarm at least 6 meters away from appliances such as boilers/heaters and ovens, because they produce combustion particles. The smoke alarm should be positioned at least 3 metres away from damp areas such as bathrooms and laundry rooms, at least 1 metre away from heaters, 0.50 metres away from lamps and 1.5 metres away from fluorescent lamps. Air flows from fans, doors and windows should also be avoided. Water vapour and gases can cause a smoke detector to give off a false alarm signal, because smoke detectors can't differentiate between those particles and smoke particles since they have approximately the same diameter.
The sensor chamber is dusty or dirty
Your smoke detector may look clean, but dust can build up on the inside of the device making the detector more 'sensitive'. Clean the detector at least once a month by gently going over the smoke detector with the dusting brush attachment of the vacuum cleaner.
Insects cover or clog the sensing chamber
Clean the smoke detector with the dusting brush attachment on the vacuum cleaner. Use insect repellent to treat the room. Careful: do not spray it on the smoke alarm itself.
Battery is low
Are you sure that it's really a false alarm, and that it's not a "low battery" signal? Check the manual to see what how this signal should sound.
Detector is malfunctioning
Detectors also give an alarm if there's a technical fault. In that case, your detector needs to be repaired or replaced.