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copied from the manual, available at the kidde website
RED AND GREEN LED INDICATORS This smoke alarm features separate red and green LED indicators. The LEDs indicate the following: GREEN LED CONSTANT ON - AC power is present. OFF - AC power is not present. RED LED - Can be seen through the Push-to-Test button. Blinks once a minute - Indicating presence of a working battery. Blinks once a second - Smoke alarm senses smoke and simultaneously sounds an audible alarm. Blinks once every 10 seconds - Smoke alarm is quieting an unwanted alarm (Model ADC only). (Interconnected system only): OFF - Another smoke alarm in the network has sensed smoke and is signalling this alarm.
Depends on the model of the detector, but wireless motions are not supposed to light up; if they light up they have been put into test mode, either by opening the tamper switch, removing and reinserting the battery, or by positioning an internal jumper to the test position. If the motion is a 5890(PI), remove the batteries and short the empty battery sockets for about 30 seconds to reset the low battery circuit, then reinsert the batteries and close the cover, making sure the tamper switch is properly closed. Other motions don't need this reset procedure, but do need all tamper switches closed. Ensure no one is moving near the motion and reset the keypad by entering your code plus Off (just like coming home). If everything is right and all other devices closed the ready light should come on.
Change the 9V backup battery,with a new one.Push and hold the reset button for a minute or two for the alarm to to go off like about 30-40 sec. for the smoke detector to dectected the 9V backup battery power sourced.The green power LED light indicator will stop flashing also the beeping sounds too.