[elevatorman]

I just got off the phone with First Alert. This is what I was told. You should replace CO detectors every 5 - 7 years. There is a list of signals on the back of the detector. 4 beeps and a pause --CO is detected. 3 beeps and a pause--smoke is detected. It also says there is a green LED on when it is connected to 110AC. They asked if the detector that was going off was near a shower or was there any sanding done recently in my home. They also asked if I had an attached garage and was the detector near the garage. I told the person that I was having 4 beeps and a pause. I then disconnected the unit that had the red LED blinking as the beeps sounded (one unit initiates all the others). I took the battery out replaced the battery and placed the unit outside, about 30 miniutes later it started to sound again. The person asked for Model #, an Issue # and a Date of Manufacture (all on the back of the unit). They are sending me a free new unit (mine was about 3 years old). I also asked if I needed it at all, my home is all electric. The answer, if you have an attached garage it is required.

FYI - It is very easy to remove the unit from the wall. 1/4 turn CCW and pull out. Then unplug the plug in the back. Another important thing to remember is that the fire dept will come and do it for you if you call and make an appt. They told a neighbor when he needed to change batteries they would rather residents call them then wait and call when they fall off the ladder.