Why do my smoke detectors beep?
Smoke detectors beep for 1 of 3 reasons. Either they are dirty and the detector sees something across its beam and calls it smoke, the battery is getting weak and a built-in alarm is warning you to change the battery, or there is some reason/cause that may trip the alarm momentarily and then the alarm resets on its own.

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1. How do I know my smoke detectors are working?
2. Why are the fire trucks seen all over town when there is no fire there?
3. Why do my smoke detectors beep?
4. Why is a fire truck always sent with an ambulance?