Some smoke detectors are hard-wired to the house electricity. A hard-wired smoke detector is one that is connected to the home’s main electrical system. 
It may also be connected to a central alarm system, allowing the fire department to be contacted automatically. Over time, the detector can gather dust, have a power surge or simply malfunction, resulting in false alarms or a steady chirping noise.
Hard-wired detectors also contain a backup battery which, over time, can die. There are multiple things that you can do to rectify the problem and it is important to properly maintain your smoke detection system.
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