Several things may be causing your alarm(s) to sound or chirp. It's important to understand the different audible signals from your alarm.
Continuous Four-Beep Alarm Pattern
When the carbon monoxide (CO) alarm senses a dangerous level of carbon monoxide, the unit will emit a loud alarm pattern. The alarm pattern is four short beeps – followed by five seconds of silence – followed by four short beeps.*
Your alarm may have detected carbon monoxide. Make sure that you know how to respond to a CO emergency.
You may be experiencing a nuisance alarm. Follow the procedure for nuisance alarms.
*NOTE: When the unit is disconnected from the 120V power supply and on battery backup, the alarm pattern will continue for the first five minutes after detecting carbon monoxide and then the cycle will repeat every minute.
Several things could cause an alarm to chirp according to a regular consistent pattern. For more information, go to what causes consistent chirping?
If you only hear one chirp every 30 seconds, this may indicate that your alarm has one of the following conditions:
Random Intermittent Chirping
Several things could cause an alarm to sound briefly or chirp randomly without a regular pattern. For more information, go to what causes intermittent beeping or chirping?
One Long, Continuous Squeal
If you hear a long, continuous squeal, this may indicate that your alarm has one of the following conditions:
Tamper-resist warning: this can be activated, causing the unit to go into alarm if it has been unplugged or has come loose from the outlet. (See your user's manual for more details.)
NOTE: For more information about your specific alarm, refer to your user’s manual.