To permanently stop the end-of-life chirp, you must replace the alarm. First Alert alarms usually last 7 to 10 years. For immediate, temporary relief from late-night beeping, press and hold the Test/Silence button; this will hush the chirp for up to 48 hours.
Three chirps (or beeps) every minute from a First Alert detector usually indicate a malfunction. This means the unit is not operating properly, often due to a failure in the sensor, dirty components, or the unit has reached its 7–10 year end-of-life, necessitating a replacement.
To instantly silence a chirping, "dying" smoke alarm, press the Silence/Hush button. To permanently disable it, twist the alarm counter-clockwise to remove it from its bracket, unplug the power harness (if hardwired), and remove the battery. Hold the Test button for 15-20 seconds to drain residual energy.
Use thumb to pull deactivation tab outward until tab snaps into place. This will discharge the powercell and deactivate the unit.
Why does my digital CO alarm say “END”? If your digital carbon monoxide alarm says “END” on the display, this means it has reached the end of its life and needs to be replaced. The alarm will also chirp 5 times per minute to let you know it's time for replacement.
To permanently stop the end-of-life chirp, you must replace the alarm. First Alert alarms usually last 7 to 10 years. For immediate, temporary relief from late-night beeping, press and hold the Test/Silence button; this will hush the chirp for up to 48 hours.
To immediately silence a carbon monoxide (CO) detector beeping due to its "end-of-life" warning, press the Test/Silence button to mute it for up to 48 hours. However, because sensors degrade over time, you must permanently replace the unit.
Press and release the Test/Silence button or use the app (if using the app to silence the warning you will need to be within Bluetooth range of the detector). The horn will chirp, acknowledging that the End-of-Life Silence Feature has been activated.
For hardwired units, a steady green LED light indicates that the alarm is receiving AC power. Battery-operated units will have a quick flash every 30-45 seconds. However, this does not necessarily mean the alarm is working. Pressing the Test button is the only recommended method to ensure functionality.
For a hard-wired First Alert smoke alarm beeping or chirping, the most common culprit is a depleted or dead backup battery, an expired unit (10-year lifespan), or loose wiring. Check the First Alert Troubleshooting Guide for complete step-by-step resolution.
A smoke detector will chirp or beep every 30 to 60 seconds for at least 7 days to signal a low battery. During an active false alarm (like cooking fumes), the continuous loud siren usually lasts 3 to 10 minutes, or until the sensor clears and the unit is reset.
Turn off the circuit breaker for your smoke alarms. If your smoke alarms don't have battery backup, doing that will turn all of them off. If your smoke alarms have battery backup, go to the faulty smoke alarm, twist off the cover. Once the wires are exposed, carefully disconnect the smoke alarm.
Low Battery or End-of-Life: This type of chirp indicates it is time to replace your smoke alarm's batteries or the smoke alarm itself. Refer to your smoke alarm's user manual for the specific beeps based on your alarm.
To stop a smoke detector from chirping without a battery, you must remove the unit from its mount, disconnect the power source, and completely drain the device's internal electrical charge.
Three beeps (often repeated every 30–60 seconds) usually indicate a low battery, a hardware malfunction, or that the unit has reached its 10-year expiration date.
A First Alert alarm flashing red usually means it is warning you of smoke/CO, indicating a low battery, or showing its memory of a past alarm. The exact meaning depends on whether it is flashing rapidly (an emergency), blinking slowly, or beeping.
The batteries are low: A blinking red light, usually accompanied by a loud beep, could mean the batteries in the unit are low. Consider adding fresh batteries and testing to ensure they're working. You need to replace it: Smoke detectors don't last forever.
To determine if a smoke detector is actually a hidden camera, check for abnormal positioning (like facing directly over a bed), irregular LED flashing (real alarms blink steadily every 5 seconds), unusual pinholes or lenses, and scan the room with your phone's camera to look for infrared (IR) night vision lights.
Yes, you can cover the light on your smoke detector, but you must do it carefully.
To silence a chirping First Alert smoke detector, first determine the cause. Usually, a single chirp every 30 to 60 seconds indicates a low battery, while five chirps a minute indicate the alarm has reached its end-of-life.
This silence feature can temporarily quiet the low battery warning “chirp” for up to 8 hours. You can silence the low battery warning “chirp” by pressing the Test/Silence button on the alarm cover.
Yes, your alarm will still go off on silent. Modern smartphones (both iOS and Android) are designed to sound alarms at full volume, overriding your silent mode, Do Not Disturb, or Sleep Focus.
A First Alert carbon monoxide (CO) detector sounding an end-of-life chirp means the internal sensor has degraded and the entire unit must be replaced immediately. CO alarms typically expire after 5 to 10 years of operation.
It is also a good idea to know the signs of a potential CO problem:
A hardwired smoke detector with a dying backup battery will typically chirp every 30 to 60 seconds for 7 to 30 days before the battery fully drains. However, if the chirping continues after changing the battery, it usually means the unit has reached its 10-year expiration date and is issuing an end-of-life warning.