Carbon Monoxide Detector: lifespan, maintenance and replacement

Typical lifespan: 5–7 years (about 7 years).

Maintenance schedule

• Test alarm button — Monthly
• Replace batteries — Every 6 months
• Vacuum dust from vents — Every 6 months
• Check manufacture date — Annually

Signs it needs replacing

• Unit is over 5–7 years old
• Chirping continues after battery replacement
• Failed self-test (end-of-life signal)
• Display is dim or non-functional
• Won't respond to test button

Tips

Install CO detectors on every level and near sleeping areas. Combination smoke/CO units simplify coverage.