The in home smoke alarms were installed when the house was built 15 years ago or so. There are four. They are AC with a 9 volt back up. They started beeping or chirping one by one. We replaced the batteries one by one, with all new batteries. I took out all the units. Two of them still chirp with "no" unit. How is that possible, maybe something in the attic?
By Charles from Bakersfield, CA
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Smoke detectors have a shelf life of about 5 years. Try vacuuming out the inside of each unit because spiderwebs and dust can cause chirping as well. They may need replacement, call the local fire department. They are usually happy to come and check it out. If you have critters in your attic, they may have damaged the wiring, the main reason wired in units are not usually recommended. I am a firefighters wife.
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