I have the 1275 model and had the same problem. Just unplug unit and remove battery. Vacuum unit to remove any dust particles. Then hold down test button for about 1 minute. This is supposed to clear out the memory. If the battery is still good put back in unit or replace with good one. Make sure when installing battery that the polarity terminals on the battery match those on the battery cover. Putting the battery in wrong will cause it to chirp also. I did this for my unit and it worked. If this does not work you may need to replace unit.
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Kidde Smoke Detector 1275
Posted by hellerusaon Oct 19th, 2008 at 9:43am
I have the model 1275 and also have the chirping nosie coming from two units. I was able to hold the button down on one of the units and now it works. The other unit it did not work on. So, I guess I need a new one.
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Kiddie 1275 (and others) manuals
Posted by asyzia2003on Nov 11th, 2008 at 1:23am
Now if I can only figure out out how to turn it off when it goes off.
How can I can the sensitivity of my detector? It is not sensitive at all. I was told it was changed so it is not sensitive. Can someone help me so I can change this?