Why does my smoke alarm beep?
The smoke detector needs to be replaced
Some newer smoke detector models will start beeping when their life-span is nearly done. Unfortunately, not all of them do this. Other models will just suddenly stop working. That's why it's important to pay close attention to the expiration date on the smoke detector. If the expiration date has passed, make sure to replace it, even if the smoke detector still works if you press the test button. It's generally a good idea to test your smoke detector once per month.
The battery's empty
As soon as the battery is nearly empty, the smoke detector will make an occasional beeping sound to notify you. In your smoke detector's manual, you can read how often the smoke detector emits this beep. Do you have a smoke detector with replaceable batteries? Replace the battery. A smoke detector without a replaceable battery needs to be replaced completely.
The new battery isn't properly secured
Did you recently install new batteries in the smoke detector and is still beeping? Check whether the batteries have been inserted the right way and whether the lid is correctly shut.
The smoke detector is dirty
It's possible that there is dust on your smoke detector, so it's important to regularly clean your smoke detectors. There are smoke detectors that warn you once they are in need of cleaning. These smoke detectors will start beeping or notify via you through the app. You can read more about cleaning a smoke detector in the following article.
The connection is defective
Smoke detectors that operate on mains power might have a defect in the connection of the smoke detector. To check this, first turn off the power in the fuse box. Disconnect the smoke detector from the ceiling. Check whether the base plate is still attached to the ceiling and check whether the wiring is correctly connected.
A technical defect
Have you checked all of the items mentioned above and is the smoke detector still beeping? There's a chance that the smoke detector might be defective. In case of a technical defect, most smoke detectors will sound an alarm. Reset the smoke detector and replace it if this doesn't work.