Isolate mains electricity supply at distribution board first.
Clean your alarm regularly, particularly in dusty locations.
narrow nozzle attachment on your vacuum cleaner to remove cobwebs, dust and insects
from around the aperture where the smoke enters.
To clean outer case,
wipe with a damp cloth and dry thoroughly with a lint free cloth.
cases of extreme contamination remove unit by depressing button on side and rotating
90° deg. anticlockwise.
Check that the openings in the sensing chamber
are not clogged by inspection through the aperture.
If they are clogged
(an extremely rare occurrence) then the unit must be replaced.
alarms are prone to insect and dust contamination which can cause false alarms
or failure to alarm. Therefore regular cleaning should be a priority.