What should be done if a smoke detector begins to chirp?

When a smoke detector begins to chirp, it typically indicates that the battery is low or there is a need to check for malfunction. In many cases, replacing the battery can resolve the issue and restore the detector's functionality. If the chirping persists after changing the battery, it may signify a malfunction that requires further investigation. This approach ensures that the smoke detector remains operational, keeping occupants safe from potential fire hazards.

Other options such as replacing the entire unit immediately would be an unnecessary step without first trying to replace the battery or diagnosing the problem. Checking for smoke in the area is important during an actual alarm situation but does not address the chirping. Resetting the detector can also help in certain cases, but it's typically a follow-up step after addressing the primary cause of the chirping, which is often related to battery issues.