Did you open one up yet? That might give you a clue ๐ค
E.g. I don't know exactly how wide the gaps are, but here it looks like small insects could get in. Maybe you have another problem than smoke ๐ซฃ
this post was submitted on 21 Jun 2024
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a spider could absolutely crawl through the grading over the detector portion. these are under warranty from my security company, so I've held off on disassembling one but I will eventually
Have you ruled out other types of fumes? Eg fresh paint, perfume, scented oil diffusers etc.
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What country? AFAIK in the US you can't make the batteries replaceable. If they are wirelessly linked they can have auxiliary batteries for that, but (I believe) that's different than the main battery...
EDIT: I seem to be thinking of California, maybe not all of US.
It's the same here in New Jersey, or at least the city I'm in. Recently a fire inspector came by the condo building I was living in & failed ~ 60% of the units because they still had the old style replaceable battery smoke detectors. Apparently going forward we are/were supposed to be using sealed battery smoke detectors & replace them entirely every ~10 years when they stop working.
EDIT: Not sure if that's OP's problem unless their alarm company is so cheap that they keep giving OP really old detectors to replace with.
Depends on what kind of detector it is but alot of them use small amounts of radiation and a detector that triggers when the number of particles detected drops below some level.
That being the case any particulate large enough to interrupt the particles could cause it to go off.
For example high humidity misty water from a shower wafting over a detector placed over the bathroom door, etc.
Are your smoke detectors linked to each other? Could be faulty wiring in the circuit, or a completely different smoke detector failing and sending out an alarm that triggers the others. The latter happened in my home when I was growing up: the living room smoke detector kept going off a few seconds before the rest of them would chime in, but it turned out it was the one in the nearest hallway that was failing and sending out bad signals. The living room detector was just the next in the circuit.
UPDATE: so they kept sending me the same model of smoke detectors so I didn't remove the old bracket, I would just mount the new detector in the old one. well, today, I see a moth larvae crawling out from behind it. I take the bracket off, and there we are; two moth nests. I think we've discovered the issue
Try replacing the batteries. That's often the reason for this type of thing.
as stated, as soon as I replaced the battery it started alarming immediately so I replaced the entire detector and it's still doing it
AFAIK in the USA you can't have the main batteries be replaceable (I think an aux battery for wireless functions is allowed...).
EDIT: I seem to be thinking of California, maybe not all of US.