this post was submitted on 21 Jun 2024
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(I have carbon monoxide detectors that are not going off)

I have smoke detectors that are incorporated into my home alarm system. The other day, the one by my front door went off for no apparent reason, twice, and when I changed the batteries, it started alarming again immediately.

there was absolutely no reason for it, there were no open windows or doors nearby, it just went off. so, my alarm company replaced it. installed the new smoke detector yesterday and... it just went off again. completely different smoke detector.

there's absolutely nothing in my house that could produce carbon monoxide, but I have separate CO detectors anyway that aren't going off. there's no smell, there's nothing visible, and these are those ~~electro optical~~ photoelectric style ones.

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[–] IHawkMike@lemmy.world 51 points 2 months ago

I found it amusing that these posts were adjacent.

[–] mipadaitu@lemmy.world 14 points 2 months ago (1 children)

Call the fire department, they have detectors that they can use to look for gas leaks and other things that can set off a detector.

You can also call your gas provider. One of those two should be able to track it down, it could be a lot of things, but two different smoke detectors going off in the same location is a huge red flag.

Best case, you have something kicking up fine dust, worst case, you have a smouldering electric fire in your wall somewhere.

Don't panic, but also do not ignore this.

[–] pelletbucket@lemm.ee 5 points 2 months ago (5 children)

The weird thing is, it alarmed three times in its current position, but when I changed the battery, it started alarming in my hands in a completely different room, which I already had two other smoke detectors in it that weren't going off.

and there's no gas. I live outside Miami

[–] Fosheze@lemmy.world 8 points 2 months ago

This makes it sound like it's probably just a defective detector. Swap it with one that hasn't been going off and see if that one starts going off too. If it doesn't then odds are something just failed in it.

You could also just try blowing some air through it to blow out any dust. But it shouldn't be that dusty after only a year so I'm still leaning towards defective.

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[–] grasshopper_mouse@lemmy.world 6 points 2 months ago

I've set one off while dying my hair.

[–] shiiiiiiiiiiiiiiiiiiiiiiiiiiiiiit@sh.itjust.works 5 points 2 months ago* (last edited 2 months ago) (3 children)

I need to replace a set of expired smoke detector at my elderly parents' house. They're too old to have alarms going off in the middle of the night just because the wind blows.

Yet, Amazon only seem to sell ones with photo-electric sensors, and many reviews complain about over-sensitivity with dust, and under-sensitivity when the room is clearly full of smoke.

Additionally, the ones with sealed 10 year batteries - many reviews report a battery life of 2 years or so in practice, with increased false positives as battery life runs down. So now, they have to replace whole units rather than just batteries.

What happened to good old ionizing smoke detectors with 9v batteries that needed replacing every 2 years or so?!

[–] Pacattack57@lemmy.world 4 points 2 months ago

Have you tried driving to the store?

[–] pelletbucket@lemm.ee 2 points 2 months ago

so the other brand I have in my house, I've been very happy with. First Alert combination smoke and carbon monoxide. The only improvement they've made is that it runs on AA instead of 9V (I'm pretty sure my smoke detectors were the only reason I was keeping 9 volt around the house anymore), and you can slide the battery tray out without removing the detector so you can disable the alarm and replace the batteries without even having to take it down

[–] Shard@lemmy.world 2 points 2 months ago

Spend a bit more on UL approved brands, those tend to be more resilient to dust.

Photoelectric type is better for home use as your typical fires are smouldering, which photoelectrics are better at catching.

Here's a deep dive if you're interested https://youtu.be/DuAeaIcAXtg

[–] wuphysics87@lemmy.ml 4 points 2 months ago

I have set off smoke detectors with a power washer and with saw dust

[–] teawrecks@sopuli.xyz 4 points 2 months ago (1 children)

I don't think this is what you're experiencing, but I had an alarm go off randomly for one beep once. Went and looked at it, and a few seconds later a spider crawled out and away from it.

If it's photoelectric, anything that could scatter light could cause it to go off. Is your house dusty?

[–] pelletbucket@lemm.ee 0 points 2 months ago (4 children)

not particularly, and this one is the closest to my air filter. they're replacing it one more time, and I'm going to put a security camera on it this time lol

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[–] Catoblepas@lemmy.blahaj.zone 4 points 2 months ago (1 children)

I’d call the fire department to ask them to come out and make sure that there’s not anything slow burning that’s hidden in the walls. Be sure to mention two separate smoke detectors have been going off. Even if that’s not what it is they’ll be fine with coming out to check.

[–] KoboldCoterie@pawb.social 4 points 2 months ago (1 children)

Anecdotally, when I was a kid, we had an electrical issue wherein a short or something was causing wires to slowly melt through their jacket, inside the wall. It was triggering smoke detectors, but we couldn't see or smell anything. Fire department came out and found it, but if we'd ignored it, it almost definitely would have been a huge house fire eventually. Definitely second this advice. It doesn't cost anything to have them come look.

[–] Max_P@lemmy.max-p.me 4 points 2 months ago

In my first apartment, I had a smoke detector that was mains powered. The wire metals weren't compatible and eventually the wirenuts burned and cut off power to half the room. The smoke detector's wires were all burnt up. It never alarmed unfortunately so I only learned about it when half the room just went dark. That could absolutely have turned into an electrical fire.

Definitely worth getting it checked.

[–] scrubbles@poptalk.scrubbles.tech 4 points 2 months ago (2 children)

Mine went off in high humidity when I showered and forgot to turn on the fan

[–] everett@lemmy.ml 3 points 2 months ago* (last edited 2 months ago)

I thought of this one too. "Photoelectric" smoke detectors are a thing, and it's good to know if that's the kind you have.

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[–] Septimaeus@infosec.pub 4 points 2 months ago (5 children)

Does anyone in your house vape?

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[–] Bedlore@aussie.zone 3 points 2 months ago

I had trouble with them going off in humidity, they were past their expiry date so replacing them fixed the issue.

[–] Jimmyeatsausage@lemmy.world 3 points 2 months ago

High humidity can cause them to go off as well. Used to use a cool air humidifier in our kids' room at night and had to stop because it would eventually set the alarm off.

[–] Etterra@lemmy.world 2 points 2 months ago (3 children)

They are probably both about the same age and need replacing. Smoke and carbon monoxide detectors have a finite lifespan, no matter how often you change the batteries. Fortunately they're not all that expensive, just get new ones. I had the same problem in my apartment last year, and the carbon monoxide detector was over 10 years old. So they just replaced it, problem solved.

[–] Kazumara@discuss.tchncs.de 4 points 2 months ago (1 children)

so, my alarm company replaced it. installed the new smoke detector yesterday and… it just went off again.

Nice theory but it's disproven by OP's initial text

[–] pelletbucket@lemm.ee 2 points 2 months ago

I think he's trying to say that maybe they sent me a new detector that was just as old as the old one, but they didn't

[–] todd_bonzalez@lemm.ee 3 points 2 months ago

Interestingly enough, smoke detectors get more sensitive as they get older, but eventually they just stop working.

If your smoke detectors go off every time you cook, it's time to replace them.

[–] pelletbucket@lemm.ee 2 points 2 months ago

I've had the first detector for like 5 years and the second had a manufacture date from about a year ago

[–] UnH1ng3d@lemmy.world 2 points 2 months ago (2 children)
[–] pelletbucket@lemm.ee 3 points 2 months ago

I wish he'd come over and tickle my balls instead of tickling my smoke detector

[–] rustyfish@lemmy.world 2 points 2 months ago

Had to scroll way too long to find the right answer.

[–] shinigamiookamiryuu@lemm.ee 2 points 2 months ago

Dust maybe? Dust can have the same particles as smoke.

[–] pelletbucket@lemm.ee 2 points 2 months ago

omg 😭😭😭 The new detector went on off in the living room where the old one did. switched it to the kitchen, put the kitchen detector in the living room, and the new one went off in the kitchen. wtffff

[–] pelletbucket@lemm.ee 1 points 1 month ago

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

[–] Kit@lemmy.blahaj.zone 1 points 2 months ago (2 children)

Spiderwebs or insects can mess with the sensors, likewise with dust. Try spraying some canned air inside. Or if it's a few years old, you may want to replace it.

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Are they Kidde? I've had 3 photoelectric Kiddes that started failing and going off randomly. I've been slowly replacing all of mine.

The builder installed them. Occasionally walking through our neighbourhood we hear other people's going off too.

[–] spittingimage@lemmy.world 1 points 2 months ago

I've had a photoelectric alarm set off by steam from a dryer in the next room, through a closed door.

[–] Hikermick@lemmy.world 1 points 2 months ago

Might be worth buying an infrared thermometer to see if there is wiring overheating in your walls. I'm not an electrician but i wonder if it's something then can happen sporadically such as if there is something drawing a lot of power that turns on/off. There are inexpensive ones out there and they can be handy to have around.

[–] aramis87@fedia.io 1 points 2 months ago

Since it went off in your hands, have you tried googling the make and model to see if there are any similar complaints or even recalls for them?

[–] pelletbucket@lemm.ee 1 points 2 months ago

update - so I've got two more diagnostic steps. I have another detector of the exact same brand in another room, I'm going to switch them and see what happens. if the detector from my kitchen starts going off by the front door, then I'm going to try another brand that I have elsewhere in the house and move forward from there.

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