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What will the FA6829S alarm sound like when it detects carbon monoxide?

Homeowner

17 March 2026

Last Updated: 30 March 2026

The alarm emits 4 loud beeps followed by a pause, repeated continuously. This pattern is distinct from smoke alarm sounds (which pulse rapidly) and from low-battery warnings (a single chirp every 40–60 seconds).

At the same time, the digital display shows a clear “ALARM” message alongside the current CO level in parts per million (ppm).

If carbon monoxide is still present, the alarm will continue until the air clears. After an event, the red memory indicator flashes to show that the alarm was triggered, even if you were not present at the time.

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