I have a total of seven hardwired fire alarms in my house—one downstairs and six upstairs. A couple of days ago, one of them chirped once. Later on, it chirped again, so I decided to change its battery. However, this morning I woke up to three of them chirping in a rotation every 30 seconds! I changed the batteries in those two and reset them, but the chirping continues. I even cut off power to the entire house, but the noise won't stop. I'm at my wit's end here. Can anyone help me figure out what's going on?
4 Answers
If you shut off the power and they’re still chirping, it might be because of the battery backup. You should check the wiring and ensure everything's connected right. You can also try unplugging each unit and plugging them back in one by one to identify the troublemaker!
There are a few things to check. First, make sure your battery terminals aren’t corroded. If you haven't, try using long-lasting batteries that last around 10 years. It’s funny how all these alarms seem to fail at once, huh?
It could be that your fire alarms are expired. Check the back of each unit for a date. If they were all installed around the same time, it’s possible they’re all due for replacement soon!
Also, if you check the instructions, they might beep differently if they’re expired versus needing new batteries.
And make sure they're all wired correctly. I bought a place that had a hardwired alarm, but it turned out the wires weren't connected properly after the inspection.
Yeah, I've faced a similar issue. It could be the alarms are just old and might need replacing altogether. Don’t worry, it’s usually not too hard to replace them yourself!

Totally! It’s like they have a secret schedule to chirp at night when you’re trying to sleep.