found it was recommended that I blow the dust out if that happens. So that's what I did and it solved the problem. In accordance with the National Fire Protection Association (NFPA), Kidde recommends replacing smoke and heat alarms every ten years, and replacing carbon monoxide and combination alarms every seven years to benefit from the latest technology upgrades. If you are unsure of your alarm's age, look for the manufactured date on the back of the alarm. a little late to the party, but try blowing the dust off it. I would also recommend getting a new digital display model. you will get a low numeric reading before the alarm would sound and I feel it is better to catch it as early as possible. After double checking everything, it turned out that the "new" batteries were not quite new as they were supposed to be since my volt meter showed them having low voltage. I also forgot about the smoke detector in the stairwell that also needed a new battery. After checking and replacing batteries, the carbon monoxide detector was throwing the random chirp so off to Lowes I went. Picked up a new detector and all is now quiet. I guess the old one was no longer usable since the I haven't heard a thing from the new.