I have the same problem as the original poster. I unplugged the smoke detector and there is still a beeping coming from the ceiling. I've replaced all batteries, I've replaced the beeping detector and still it beeps. I guess I will check the attic to see if there is a detector up there.
We are currently having the same issue as the original poster as well... now the chirping is every three hours like clockwork and lasts for half and hour. Driving us crazy. The alarm that is still chirping is not even attached to the wall anymore, its as if the wires are chirping! Not possible it seems but that's whats happening...
MSOMAHA, did you figure out the source of the annoying chirping yet? Did you try shutting off the power to see if it continued? I agree with the other poster, there has to be another source emitting that beeping sound. Another detector, or anything that may beep when the battery is low. My grandmother had a similar problem once and we searched her home high and low several times trying to find out what was beeping once about every five minutes. I finally opened a kitchen drawer and found her old cellphone there which she had never turned off. It was beeping because of the low battery. We couldn't believe it. Good luck!
Im having this issue with a battery operated detector. Replaced it with a new unit and the new one is chirping three times once every half hour in the middle of the night. How can it be happening with a new unit with new batteries and why only when i am sleeping?
i am having same issue. i took the detector away and put it in the garage when it was originally connected in the hallway of our living room. STILL BEEPS! there is no smoke detector and Fn thing still beeps somewhere up in the ceiling. its very annoying.