![]() If the unit does not alarm, make sure it has been activated correctly, and test again. The alarm sequence should last 5-6 seconds. The alarm horn will sound: 4 beeps, a pause, then 4 beeps. You can test this CO Alarm by pressing the Test button on the Alarm cover until alarm chirps. How do I know if my First Alert carbon monoxide alarm is working? Contact the manufacturer or the retailer where you purchased the alarm. Three beeps, at 15-minute intervals = MALFUNCTION. What does 3 beeps mean on a First Alert carbon monoxide detector?Ģ. 5 beeps every minute: This means your alarm has reached the end of its life and needs to be replaced with a new carbon monoxide alarm. What does it mean when First Alert carbon monoxide detector beeps?ġ beep every minute: This means that the detector has low batteries and you should replace them. Replace with a new alarm as soon as possible. Other alarms, made for people who are deaf or hard of hearing, shake your pillow or have a strobe light. ![]() Some newer alarms also have a voice that gives you directions. A single chirp means the battery is low or the detector should be replaced. After ~2-3 weeks, the warning cannot be silenced. Carbon monoxide alarms alert you with four beeps. After about 2 days, the warning will resume. ![]() Use the Test/Silence button to hush the warning. What does 5 chirps mean on First Alert?ĥ chirps (about 1x per minute): End-of-life (EOL) chirp This chirp means it is time to replace your carbon monoxide alarm. If the unit still does not alarm, replace it immediately. It is time to replace the batteries in your carbon monoxide alarm. You can test this CO Alarm by pressing the Test button on the Alarm cover until alarm chirps.
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