If your carbon monoxide alarm goes off, the first thing to do is to make sure everyone is feeling okay that is present inside the house. If anyone has flu-like symptoms, contact 911 and get outside for fresh air. If the alarm on your carbon monoxide detector is going off in a continuous, shrill way, get outside to fresh air right away. Call 911 once safely outside to report the incident and if there is anyone experiencing carbon monoxide poisoning symptoms. Do not open your windows. Make sure you contact your emergency provider to give you the all-clear before re-entering your dwelling. If your carbon monoxide alarm is going off in one of the other ways it can beep, try replacing or checking the battery. Its essential to understand why your alarm is going off in order to best respond in the event of an emergency.