If you think you are suffering from chronic, low level exposure to carbon monoxide below the detection level of residential detectors, contact your doctor immediately and have your home checked by a professional, with equipment to detect lower concentrations. Make certain everyone is accounted for. The instructions depend on the kind and date purchased and the features available. For instance, some detectors have a combination of reset buttons, silencing features, malfunction indicators, test buttons, visual indicators, operating indicators, low battery warnings, warning alarms, and full alarms. Some detectors have warning alarms, which sound at low levels, and a full alarms, which sound at high levels.
Some detectors are more sensitive than others.
If no one has CO symptoms, the above procedure, including having the home checked by a qualified professional, can be used. Find out what caused the alarm. Contact your heating contractor for help in tracking down the CO source. Do not assume, that because you can't see, taste, or smell anything, there is no problem. Carbon monoxide has no color, taste, or odor.