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The comparable Kidde alarms had similar issue when they first came out several years ago. Thanks to one of my property owners, it was pointed out to me that they have a very specific initialization sequence, if it’s not followed properly, nuisance alarms will happen. A couple of my local electricians further confirmed this. They had to be connected to the 120 power before activating the internal backup battery which was different than usual as most would install the batteries where it’s easy while standing on the floor rather than up the ladder.
Might be similar issue with the First Alert ones.