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MN | Try having those hardwired ones go off at midnight and then every 15 minutes until you figure out which one is the offending unit - no sleep that night. Replaced all of the units after that just in the last few months (they were 10 years old) . Then happened again - figured out which one was the offending unit - at 1 am - sprayed with canned air before that - continued to go off every so often - pulled off the ceiling and still haven't replaced - no sleep that night either. | |
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Smoke detector chirping?
