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
whentoreplace.com
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