Smoke detector low battery chirp
Solution: Change the battery in the smoke detector.
You'll need: A 9v battery. Available for a few dollars at any supermarket.
Method: Twist the detector (usually anti-clockwise) firmly but do not force. It should turn then fall away from the mounting. The battery should be under a small door with a twist-clip. Twist the clip and change the battery. The battery door may not close without a battery installed. Once the battery is changed, twist the detector back into place.
Sounds like: A short beep or chirp sound every 30 seconds to 5 minutes. The sound repeats until the battery is changed.
Sound location: The sound comes directly from the detector its self.
Description: Modern smoke detectors can be connected to your security/alarm system but they also act as stand-alone devices, using the alarm for reporting and added warning systems.
Modern smoke detectors are connected to your homes’ (240v) power but for many years smoke detectors were powered by batteries alone. Detector batteries can last several years BUT batteries should be changed annually.
Whatever its primary power is, all smoke detectors have a battery (most often a 9v battery). When this battery is almost depleted the detector will begin to emit a repeating beep/chirp sound this will continue until the battery is changed. The smoke detector stores a small amount of charge independent of the battery and can beep/chirp a few times even without the battery installed. 240v powered detectors chirp when their backup battery is low even if there is no other power issues.
Once you have replaced the battery the smoke detector should no longer make the sound.