The answer to 'why is my carbon monoxide detector buzzing noise' is that a beeping or buzzing carbon monoxide (CO) detector is typically an indication of a potential CO leak or other issue that requires immediate attention. Carbon monoxide is an odorless, colorless gas that can be deadly, so a CO detector sounding an alarm is a serious warning sign.
Some common causes of a buzzing CO detector include low battery, sensor malfunction, or the presence of dangerous levels of carbon monoxide in the home. If the alarm is sounding, you should immediately open windows, evacuate the home, and call your local fire department or a professional HVAC technician to investigate the issue and ensure your home is safe.