If we're talking about smoke alarms, either battery powered or connected to the household electricity, replace the battery (many electric smoke alarms have a battery for backup). These must be replaced every 10 years as well. Check the label on the bottom of the device (sometimes on the face for CO detectors) for instructions.
SOURCE: just replaced battery in smoke detector and wont stop beeping
take it apart and looked for a silver metal, quipe it and it will be fine.
SOURCE: My alarm and smoke detector keeps beeping a single
Ours keeps chirping even after we replaced the battery. I'm not sure how to fix it.
We are going to try and clean it but if it keeps doing it after that then I guess it means it needs to be replaced, right?
SOURCE: My SS785 smoke detector "chirps"
The unit may simply need cleaning. As dust and lint will accumulate on the unit and in the senors.
You can accomplish this with a can of compressed air with a straw nozzle (like you clean your computer with). Carefully remove the cover and blow out all the nooks and crannies of the detector. If you can't remove the cover, stick the straw nozzle into any opening you can see and give it a quick blast of air.
The detector may alarm due to the COLD air from the can. But, should stop once it warms back up.
You should clean all the detectors in the house at least every 6 months.
I find it unusual, that there is no battery backup in your detector. What happens if you have a fire during a power outage?
SOURCE: Our hard wire smoke detector
Change the 9V backup battery,with a new one.Push and hold the reset button for a minute or two for the alarm to to go off like about 30-40 sec. for the smoke detector to dectected the 9V backup battery power sourced.The green power LED light indicator will stop flashing also the beeping sounds too.
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