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Why is my carbon monoxide alarm beeping or chirping?

Nov 1, 2011

NOTE: Several things may be causing your alarm(s) to sound or to briefly chirp. It is important to understand the different audible signals from your alarm.

Condition: Continuous Four-Beep Alarm Pattern

NOTE: 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.*

*NOTE: When the unit is disconnected from the 120V power supply and is on battery backup, the alarm pattern will continue for the first five minutes after detecting carbon monoxide and then the cycle will repeat every one minute.

Condition: Consistent Chirping

NOTE: Several things could cause an alarm to chirp according to a regular consistent pattern. For more information, go to What are the causes of consistent chirping?

If you only hear one chirp every 30 seconds, this may indicate that your alarm has one of the following conditions:

Condition: 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?

Condition: 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- can be activated to cause 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)
  • Alarm malfunction

NOTE: For more information about your specific alarm, refer to your user’s manual.

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