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If your First Alert smoke alarm or carbon monoxide alarm is chirping, acting unusually, or not returning to normal after a battery change or alarm event, a reset may help clear the issue. In many cases, resetting the alarm can remove residual charge, clear temporary trouble conditions, and help the unit restart properly.
The reset steps can vary slightly by model, but the instructions below cover the most common First Alert smoke alarms, CO alarms, and combination smoke and carbon monoxide alarms.
When You May Need to Reset an Alarm
You may want to reset your alarm if you notice one of these common situations:
The alarm keeps chirping after a battery replacement
The unit sounds unexpectedly after a nuisance event like cooking smoke
The alarm does not respond normally during testing
The unit was unplugged or lost power during an outage
You replaced the battery but the warning condition did not clear
The alarm was removed from the bracket and reinstalled
Important Safety Note Before Resetting
If your alarm is sounding because of possible smoke or carbon monoxide, do not assume it only needs a reset. Treat every alarm as real until you know there is no danger.
For smoke alarms: Get everyone out and follow your fire escape plan if there is real smoke or fire risk.
For carbon monoxide alarms: Move to fresh air immediately and seek emergency help if needed.
Only troubleshoot or reset the alarm after the area is safe.
Before You Reset the Alarm
A reset often works best after you check a few basic items first:
Make sure the battery is fresh and installed correctly if your model uses one
Make sure hardwired or plug-in alarms have power
Check that the alarm is fully attached to its mounting bracket
Vacuum around the outer vents to remove dust and debris
Know whether your model is battery-powered, plug-in, or hardwired with battery backup
How to Reset a Battery-Powered First Alert Alarm
This method is commonly used for battery-powered smoke alarms, carbon monoxide alarms, and combination units.
Remove the alarm from the mounting bracket if needed.
Open the battery compartment and remove the battery.
Press and hold the Test/Silence button for 15 to 20 seconds.
This helps drain residual power stored in the alarm.
Install a fresh battery of the recommended type.
Close the battery door completely.
Reattach the alarm to the mounting bracket.
Press the Test/Silence button again to confirm the unit is operating normally.
How to Reset a Plug-In First Alert CO Alarm
Many plug-in carbon monoxide alarms can be reset using the steps below. Some plug-in models also include battery backup, so check that as well.
Unplug the alarm from the wall outlet.
If the unit has a backup battery, remove it.
Press and hold the Test/Silence button for 15 to 20 seconds.
Reinstall the backup battery if your model uses one.
Plug the unit back into the outlet.
Press Test/Silence to make sure the alarm sounds and returns to normal standby mode.
If the alarm does not reset properly, also confirm that the outlet has power and that the plug is fully seated.
How to Reset a Hardwired First Alert Alarm
Hardwired alarms usually receive AC power from the home and often include battery backup. Resetting them involves removing both sources of power temporarily.
Turn off power to the alarm at the circuit breaker.
Remove the alarm from the mounting bracket if applicable.
Disconnect the wiring harness if your model design allows for it.
Remove the backup battery.
Press and hold the Test/Silence button for 15 to 20 seconds.
Reconnect the wiring harness if disconnected.
Reinstall or replace the backup battery.
Reattach the alarm to the bracket.
Restore power at the breaker.
Press Test/Silence to confirm the alarm works correctly.
How to Reset an Interconnected Alarm System
If you have interconnected First Alert alarms, one unit with a problem can sometimes affect the whole system. If one alarm continues chirping or signaling trouble, it may help to identify the specific unit first.
Listen carefully to determine which alarm is initiating the chirp or alert.
Reset that alarm first using the appropriate battery, plug-in, or hardwired method.
Test the system again after resetting the individual unit.
If needed, test additional alarms one at a time to find the source of the issue.
In an interconnected setup, a single low battery, end-of-life condition, or mis-seated unit can sometimes cause confusion when troubleshooting.
What to Do if the Alarm Keeps Chirping After a Reset
If resetting does not solve the problem, there may be another cause that still needs attention.
Replace the battery with a fresh recommended battery if you have not already done so
Check the battery drawer or door to make sure it is fully closed
Confirm AC power is present on hardwired or plug-in models
Clean the alarm to remove dust from the vents
Check the age of the unit to see whether it may be at end-of-life
Make sure the alarm is fully mounted on its bracket
If the alarm still chirps or fails testing after these steps, replacement may be the best solution.
How Resetting Differs From Silencing
Customers often use the words reset and silence interchangeably, but they are not always the same thing.
Silencing usually means temporarily muting an alarm during a nuisance event such as cooking smoke.
Resetting usually means removing power and clearing stored charge or a temporary trouble state so the unit can restart cleanly.
If an alarm keeps chirping after being silenced, it may need a full reset or additional troubleshooting.
Helpful Reset Tips
Use a fresh battery instead of moving an old battery from another device
Press and hold the button long enough to fully discharge stored power
Test the alarm after every reset
Keep the model manual if you want to confirm voice prompts, LED patterns, or model-specific steps
Label the install date so it is easier to track alarm age over time
When a Reset Will Not Solve the Problem
A reset is helpful for many temporary conditions, but it will not fix every issue. You may need to replace the alarm if:
The unit has reached the end of its service life
The alarm has physical damage
The sounder is weak or inconsistent during testing
The unit repeatedly fails testing
The chirping or warning returns immediately after a full reset and battery replacement
FAQs
Why is my First Alert alarm still chirping after I changed the battery?
The alarm may still need a full reset, the battery may not be installed correctly, the battery door may not be fully closed, or the unit could be at end-of-life. Cleaning and checking mounting can also help.
How long should I hold the Test or Silence button when resetting?
A common reset method is to hold the Test or Silence button for 15 to 20 seconds after removing power. This helps discharge residual electricity inside the unit.
Do I need to remove both AC power and battery on a hardwired alarm?
Yes, on many hardwired models you should remove AC power and the backup battery before holding the Test button. This allows for a more complete reset.
Will resetting the alarm fix every chirping problem?
No. A reset can clear temporary issues, but it will not fix end-of-life warnings, physical damage, or alarms that have reached the end of their usable service life.
Should I reset an alarm during a real smoke or CO emergency?
No. If there may be real smoke or carbon monoxide present, respond to the emergency first and get to safety. Only reset the alarm after the danger has been addressed.
How do I know if I should replace the alarm instead of resetting it?
If the unit still chirps, fails testing, has visible damage, or has reached end-of-life, replacement is usually the safer long-term solution.
Final Reminder
Resetting a First Alert smoke or CO alarm is often a simple process, but it works best when combined with fresh batteries, proper cleaning, and routine testing. If the alarm still does not return to normal after a full reset, replacing the unit may be the best next step for reliable protection.
Related Support Topics
Explore related support articles and resources for this topic.
Learn how often to test smoke and CO alarms, how to test step-by-step, what to do if a test fails, how to reset First Alert alarms, and how monthly cleaning helps prevent false alarms.
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