When to Replace

When to Replace

CO Detector

Every 5-7 years

CO sensors degrade faster than smoke detectors. Expired units may not detect dangerous levels.

Replace sooner if

  • End-of-life chirp pattern
  • Test button non-responsive
  • Over 7 years old

Make it last

  • Test monthly using test button
  • Install near sleeping areas
  • Check manufacture date on back of unit

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