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Weak batteries
If the detector's battery charge falls below a certain value, the detector
signals this with a Red LED Flash and an acoustic warning tone (every
53 seconds). If this warning signal sounds, the detector batteries must be
immediately replaced with new batteries.
From the time of the first battery warning signal, the detector is
still operable and completely functional for at least 7 more days.
Self-test with automatic error message
The smoke alarm device periodically runs a self-test.
If the trigger sensitivity of the detector falls below the required minimum
threshold (e.g. as a result of excess contamination of the smoke
measurement chamber), the detector beeps twice and the red LED flashes
every 53 seconds.
If the error message does not clear after the detector has been
cleaned, the detector must be replaced immediately (see “Care
and maintenance” chapter).
