How often should I test smoke and carbon monoxide alarms?
Test alarms regularly using the manufacturer button and replace batteries and complete units on the schedule printed by the manufacturer.
Urgency: low
What this means
Record installation and replacement dates on the unit or in your home maintenance log.
Safe checks
- Use the test button
- confirm audibility in sleeping areas
- replace chirping batteries if permitted
- verify certification and expiry markings.
Stop and get help if
- Treat a real alarm pattern as an emergency. Replace damaged, expired, painted-over, or non-responsive alarms immediately.
Which professional to call
Contact the matched licensed or qualified trade if safe checks do not resolve the issue.
Find the relevant tradeSource and method
This answer combines HomeSOS's structured triage with safety boundaries supported by a public source. It does not replace inspection.
Health Canada: Home safety and indoor air guidanceReviewed August 12, 2026