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What are the End-of-Life warnings on a carbon monoxide alarm?

Feb 23, 2016

End-of-life warnings - required for your safety

In 2009, Underwriters Laboratories (UL), began requiring an end-of-life warning to alert homeowners when their carbon monoxide alarm has reached the end of its useful life. As an industry leader committed to safety, Kidde has included this feature in all of its carbon monoxide alarms since 2001. Kidde carbon monoxide alarms have a proven life of seven to ten years, depending on the model type.

As of 2013, ALL Kidde carbon monoxide alarms have a 10 Year life, with the following exceptions: Model KN-COEG-3 (900-0113), KN-COPE-I (900-0232) and KN-COPP-3 (900-0099).

Important! Carbon monoxide alarms do not detect the presence of carbon monoxide when in end-of-life mode.

Replace your carbon monoxide alarms before the end-of-life warning. If you think your carbon monoxide alarm is nearing its end-of-life, replace it today

*Models equipped with end-of-life hush feature can be temporarily silenced for 3-day intervals for a total of 30 days.

Is your carbon monoxide alarm beeping?

To determine if your alarm is at the end of its life, refer to the following:

  • End-of-Life warning will occur every 30 seconds
  • If the alarm has a digital display, it displays the ERR or END error code.
  • Replacing the battery WON'T STOP the beep
  • The beep will ONLY STOP when the alarm is out of power


Find out if your beeping alarm is in end of life:


Important! Carbon monoxide alarms do not detect the presence of carbon monoxide when in end-of-life mode.

Immediately replace your CO or Smoke/CO combination alarm with a new one.

For more replacement assistance, please email or call Kidde Consumer Product Support at 1-800-880-6788.

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