Recently three of our neighbors have had the smoke and or CO detector alarms start chirping. The chirping pattern is suppose to provide a clue to assessing the problem - assuming you can find the right manual when needed. You could probably find the manuals on line if you can't find the printed ones that came with the house. One neighbor had the fire department check her system(s) for problems. Then the fire department replaced all the batteries for her as she had batteries but no ladder.
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In theory there is no difference between theory and practice. In practice there is. Yogi Berra.
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