A brief chirp at intervals is different from a continuous smoke alarm. Low battery, end of service life, dust, or a fault can cause chirping; first identify the pattern and the alarm model.
Separate a chirp from an active alarm
If there is smoke, burning odor, or a full alarm pattern, evacuate according to your safety plan. Do not assume every sound is only a battery warning.
Replace the battery when the model uses one
Use the correct battery type and polarity. Some sealed alarms do not have replaceable batteries and must be replaced at end of life.
Check age and end-of-life indication
Many smoke alarms have a limited service life. Check the manufacturing date, manual, and chirp pattern to determine whether replacement is due.
Clean without disabling protection
Gently vacuum exterior vents if the manual allows when dust is present. Do not cover the alarm or permanently remove its battery just to silence it.
Sources
- U.S. Fire Administration — Smoke Alarms — Smoke alarm placement, testing, replacement, and alarm response.