The main reasons for carbon monoxide detectors to go off are the device might be genuinely working brilliantly. Thus, providing you with the alarm with CO detection in the air. Or, it might be a false alarm or machine malfunctioning, and lots more. Suppose the device is working properly and detects CO in the air or from the neighbour’s house. Then, the first thing which you need to do for your family’s safety- turning off all the appliances at home. Like, cookers, food processors, or anything. Next, open all the doors and windows to get in the fresh air. And call the technicians to address the problem and get it fixed.