If the smoke alarm is connected to a circuit with such a device, the alarm may chirp when the other device is switched on. If this is the case and the device is plugged into a wall outlet, move it to another outlet on a different circuit.. Beeping or chirping smoke detectors are beyond annoying. Usually, a chirp every 30 to 60 seconds just indicates a low battery. "If it has a 9-volt battery, it needs to be changed," says.
Even mains voltage smoke detectors have a battery back up in case the mains power fails. The smoke detector may beep to let you know that mains power has failed or the battery is in need of replacing.. Hard-Wired Smoke Alarms - These devices are connected to the AC power supply in your home and will include backup battery protection for.. A hard-wired smoke detector usually chirps because of 1 of these 3 problems: A dead backup battery. Dust inside your detector. Malfunctioning/old detector. How to stop a hardwired smoke detector from beeping? Reset the Smoke Detector: Sometimes, a smoke detector just needs a good reset to stop the chirping.