Which situation matches?
It is sounding a full alarm
Leave the building and follow your escape plan. Call emergency services from outside.
It is a periodic chirp
Identify the model and read its signal code. Replace only a user-replaceable battery as instructed.
It is expired or cannot pass its test
Arrange prompt replacement using the correct device. Do not leave the home without required working alarm coverage.
Prepare for the next step
Alarm manuals, a safe way to reach the test button and approved replacement batteries where applicable.
Record when the symptom began, what changed and which observations you can make safely. Do not dismantle equipment simply to provide a more detailed description.
Follow the full guide
Test and maintain your smoke alarms
The full guide explains the safe procedure, mistakes to avoid, professional stopping points and prevention. Browse supporting publisher tutorials, or use the moderated Q&A for a non-urgent question.
Sources and limits
Documentation checked November 4, 2026. AI-assisted educational content; no property inspection or licensed professional review is claimed.