THE GUIDE / Home safety
When a smoke alarm starts chirping
A periodic chirp can indicate a low battery, a fault or an alarm at the end of its service life. An alarm signal is different and must be treated as an emergency.
What you can check
- 01
If the alarm is sounding continuously, you smell smoke, or you suspect fire, leave immediately and call emergency services from outside.
- 02
For an isolated periodic chirp without signs of danger, check the alarm’s label and manufacturer instructions for its meaning.
- 03
Replace a user-serviceable battery only as instructed, and test the alarm using its test button.
Safety first
Never disable an alarm to silence it. If it is hardwired, inaccessible, damaged or the chirp continues, do not open wiring; seek qualified help.
When to ask for help
Ask a qualified professional or building manager to inspect or replace a faulty or expired alarm.
Ask about this issueGeneral guidance only. Every home is different; stop if you are unsure or conditions are unsafe.