Why is my First Alert smoke detector blinking green?
For most residential smoke detectors, blinks are common; you need to be conversant with the colors showing. Different smoke alarms use the green and red LED to indicate the device's power status such that a flashing green means low battery while a constant blink means AC power is connected.
Why is my First Alert smoke detector flashing?
If your detector or alarm has a blinking or steady light with no audible alarm sound, this typically indicates that the unit is receiving power.
How do I know if my First Alert smoke detector is bad?
0:534:34Cleaning Smoke Alarms – Identifying a BAD Detector – YouTubeYouTube