Question by
themperrys (1)
What does the constant red LED indicator means on a DS284TH smoke detector?
It beeps every ten minutes or so. have a hardwired security system with 12 DS284TH smoke detectors on it. There's two 12V battery backups which I just replaced. 11 of the detectors blink (red) slowly. One of them is steady red and one has no light on.