If your smoke and carbon monoxide detector keeps going off for no reason, it can become easy not to trust it, which could be dangerous. Aside from being dangerous, though, a smoke detector that goes off for no reason is simply annoying. There are two possible explanations for a smoke detector that goes off without reason. One is dust on the detector’s sensors, meaning that a quick cleaning could fix the problem. If this doesn’t work, your detector is likely malfunctioning and needs to be replaced. Also note that there is a difference between a smoke detector that is going off for no reason and one that is just beeping. In battery operated units, if your smoke detector is just beeping it likely means the batteries need to be replaced.