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What to do if carbon monoxide is detected

Because you can't smell or see carbon monoxide (CO), when Google Nest Protect alerts you that there is carbon monoxide in your home, immediately move to fresh air.

If you get a carbon monoxide alarm, Nest Protect will tell you to move to fresh air. Helpful information about what to do in the event of an alarm will be available anytime on your Nest app. If your alarm is connected to Wi-Fi, you will also receive a push notification from Nest with these instructions during the emergency.

The U.S. National Fire Protection Association (NFPA) warns that the "actuation of your carbon monoxide alarm indicates the presence of carbon monoxide (CO) which can kill you." According to the NFPA , this is what you should do if CO is detected in your home.

If an alarm signal sounds:

  1. Operate the silence/reset button (press the button on Nest Protect).
  2. Call your emergency services (fire department or 911).
  3. Immediately move to fresh air - outdoors or by an open door or window. Do a head count to check that all persons are accounted for. Do not reenter the premises nor move away from the open door/window until the emergency services responders have arrived, the premises have been aired out, and your alarm remains in its normal condition.


  • After following steps 1 - 3, if your alarm reactivates within a 24 hour period, repeat steps 1 - 3 and call a qualified appliance technician to investigate for sources of CO from fuel burning equipment and appliances, and inspect for proper operation of this equipment. 
  • If problems are identified during this inspection have the equipment serviced immediately. 
  • Note any combustion equipment not inspected by the technician and consult the manufacturers' instructions, or contact the manufacturers directly, for more information about CO safety and this equipment. 
  • Make sure that motor vehicles are not, and have not been, operating in an attached garage or adjacent to the residence.

This information is also available as a label provided in the packaging. Stick this label in a spot where everyone can see it, like the refrigerator.

Be prepared with What To Do in the Nest app

What To Do gives you useful advice on how to prepare for an emergency ahead of time.

Learn about the Nest app’s What to Do feature

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