Smoke alarms occasionally beep due to low batteries. Check the battery, especially in older detectors requiring a 9-volt or AA battery, and replace it if necessary. If the beeping persists, it might be due to dirt accumulation, so clean the detectors gently using a vacuum hose or a damp cloth. Additionally, test the alarm using the “test button” and consider replacement if it’s more than 10 years old.
Find more details on stopping smoke alarm beeping in this article.