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fire alarm. Didnt know what it was until I remembered I had a lock with batteries. It makes a series of beeps like someone was punching in the code and then a long loud beep like the alarm
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alarm. since they all ring together, the only way to tell which one is causing the problem is to look for one where the leds are different than the others. If your detectors are more than 10 years old
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Question about i12040 Hardwire Smoke Alarm with Hush Feature and Battery Backup
...detectors'. That means they had them, but the batteries were dead or not installed.
https://www.thestar.com/news/gta/2017/02/22/no-smoke-alarms-in-brampton-house-fire-where-3-died.html
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