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To determine if your carbon monoxide digital alarm has reached its end of life, refer to the following:

Manufactured between January 1, 2000 and January 31, 2006

  • When the CO alarm displays an Err message-err message, push the Peak level button.
  • If it then displays an E09 message-E09 message, the alarm has reached the end-of-life.
  • The alarm will also emit a quick beep every 30 seconds.

Alarms manufactured from February 1, 2006 forward

  • When the CO alarm displays an End message-end message, the alarm has reached the end-of-life.
  • The alarm will emit a quick beep every 30 seconds.


When an alarm has reached the end of its life, it needs to be replaced to continue protecting your home. 



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