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THE PROBLEM: Like many of you, I had the you-know-what scared out of me in the middle of the night with what turned out to be a false alarm. I called First Alert, and the agent's first question was whether the unit was located near any type of air vent, fan, return grille, etc. Mine was about 6 feet from a ceiling air vent. THE FIX: Apparently any molecule of dust on the sensors inside the unit can trigger false alarms, so his recommendation was to blow air all around and inside the unit using a can of compressed air or a hair dryer on the cool setting. I used the reverse/blower function on my shop vac, and blasted it from the top and sides. BEFORE YOU REINSTALL BATTERIES: Hold down the test/silence button for 10-15 seconds, then proceed to install the batteries. It's back to normal and working/testing perfectly.