hager TG550A Guide D'installation page 98

If the audible detection head fault indication occurs at an inconvenient time, it can be
postponed for 12 hours over a maximum duration of 7 days by pressing the test
button until you hear the first beep.
You have these 7 days to clean the detector.
• If sounding continues after a postponement attempt, this means that the
detection head is not working. Replace the detector.
• If the detection head fault indication occurs at night, this means that it is
not working.
Replace the detector.
• If the detection head indication does not stop after cleaning, replace the
detector.
5. Maintenance
5.1. Cleaning the detection head
It is essential to keep the detector clean. The slots in the detection head must be
vacuumed at least once a year or every time the detector indicates that its detection
head is dirty (see Fault indications).
5.2. Replacing the detector
When you replace the detector, you must also replace its mounting base.
If the detector is replaced because of a battery or detection head fault, press
1
on the test button until it beeps to clear the fault.
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