First, look for a button called 'silence' or 'reset'. Hold this button down for 10 or more seconds. Release the button, and the LED lights should blink or turn back on. Your unit might also let out a singular beep.
The chirp will not stop until the unit is powered off. You'll know that it is an end-of-life warning and not a low battery warning because replacing the batteries will not stop the chirp. The chirp will stop only when the alarm is powered off.
1 Beep Every Minute: Low Battery. It is time to replace the batteries in your carbon monoxide detector. 5 Beeps Every Minute: End of Life. This type of chirp indicates it is time to replace your carbon monoxide alarm.
Never ignore the sound of the alarm! If the alarm is sounding, pressing the Test/Hush button will terminate the alarm. If the CO condition that caused the alert in the first place continues, the alarm will reactivate.
What is important is that when an end-of-life signal is sounded, the CO alarm must be replaced. This is true if the unit is a standalone CO alarm, or in a combination unit with a smoke alarm.
Press the test/hush switch. The detector sounds again after 5 minutes if the alarm condition continues. In Alarm: the detector is silenced for 5 minutes. It will sound again after 5 minutes if the carbon monoxide is still detected.
On First Alert carbon monoxide detectors, check to see if the battery light is yellow or green. If the alarm is chirping and the light is yellow, it means the battery is low. The way to get a carbon monoxide alarm to stop chirping is to replace the battery.
Replace the batteries to silence the “low battery” beep, or press and hold the test/silence button to turn off the high-CO warning alarm. During an alarm, evacuate immediately and call emergency services. Make sure everyone is accounted for and check for CO poisoning symptoms.
All CO alarms produced after August 1, 2009 have an end-of-life warning notification that alerts the resident that the alarm should be replaced. The CO alarm will beep every 30 seconds or display ERR or END. If a CO alarm is at its end-of-life, replacing the battery will not stop the beep.
1 Beep Every Minute: Low Battery. It is time to replace the batteries in your carbon monoxide alarm. 5 Beeps Every Minute: End of Life. This chirp means it is time to replace your carbon monoxide alarm.
A First Alert® carbon monoxide detector life span is warranted for 7 years. After 7 years any detector should be replaced with a new CO Alarm. Alarms may have an actual life span that is shorter due to environmental conditions and may need to be replaced sooner.
Turn the screw to the “OFF” location. This will deactivate the alarm, stop the low battery chirp and render the alarm safe for disposal by draining the battery. NOTE: Turning off the alarm is permanent. Please contact product support at 1-800-880-6788 before deactivating the unit.
Press and hold the test button for at least 15 seconds. The unit may chirp or alarm for a few seconds before going silent. Reconnect the power and reinstall the battery. The unit will chirp once when the power is restored and should not chirp afterwards.
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.
Pressing the Alarm Hush button on the unit will mute the sounder for 5 minutes.
The beeping sound the low battery alarm makes can become very annoying but can be disconnected by removing the drained battery from your home alarm system panel. Make sure to replace the drained battery with a new one to keep your home alarm system functioning properly.
It's important to reiterate: Carbon monoxide can be fatal. Because CO detectors protect people from this dangerous gas, incessant chirping should signal occupants to immediately leave the residence or place of business. This deadly gas may be present, and fire emergency professionals should be contacted, immediately.
Clear Residual Charge to Stop the Chirp
Open the cover and take out the battery. Press and hold the test button for 15-30 seconds. This will fully reset the smoke alarm and drain any charge left inside. Insert the new battery and close the battery compartment.
This may silence the alarm for a brief period, but it will reactivate if CO levels remain high.
You can silence the low battery warning “chirp” by pressing the Test/Silence button on the alarm cover.
How to test your carbon monoxide detectors to ensure they are working properly? To test your carbon monoxide detectors, press and hold the test button on the alarm. The detector will sound 4 beeps, a pause, then 4 beeps for 5-6 seconds. Refer to the user manual for your specific model.
To get a smoke alarm to stop chirping, press its hush/silencing button.
False or nuisance alarms are when your smoke detector or CO alarm goes off, but there is no presence of smoke or carbon monoxide in your home. However, if your smoke or carbon monoxide detector sounds indicating an emergency and you are not certain it is a nuisance alarm, evacuate the home and call 9-1-1.