Bosch Professional GAS 18V-12 MC Original Instructions Manual page 27

Air Flow Alarm
The air flow alarm is automatically triggered as soon as the
air flow falls below the minimum value set by the relevant
standard. When an air flow alarm is triggered, the air flow
alarm indicator (1) flashes yellow, the statusbar (2) flashes
yellow and an audible signal sounds.
Switch off the dust extractor and eliminate the cause of the
alarm.
After each step, check whether the air flow alarm is still ac-
tivated by switching on the dust extractor. In this case,
switch off the dust extractor and perform the following ac-
tions. Proceed as follows:
– Check that there is sufficient air flow through the connec-
ted power tool.
Open the false air intake (42) of the dust extraction
adapter (21) or the false air intake of the power tool com-
pletely.
– Check the state of charge of your rechargeable battery.
If the rechargeable battery is running low on power,
charge or change the rechargeable battery.
– Check the plastic bag (36).
If it is full, switch it out for another one.
– Disconnect the vacuum hose (20) from the dust ex-
tractor.
If this ends the air flow alarm, check the vacuum
hose (20) for kinks and remove any suction residues in
the hose or the fitted nozzles.
– Activate the manual filter cleaning (see "Manual Filter
Cleaning", page 27).
– Clean the main filter (32) (see "Cleaning/replacing fil-
ters", page 28).
– Change the main filter (32).
If all measures have been carried out to no success, contact
an authorised Bosch after-sales service centre.
Manual Filter Cleaning
Only carry out the filter cleaning with the dust ex-
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tractor switched off and the turbine stationary.
The filter cleaning function should be activated at the very
latest when the suction power is no longer sufficient.
How often filter cleaning needs to be carried out will depend
on the type and quantity of dust that has been extracted.
With regular use, the maximum conveying capacity will be
maintained for longer.
For the filter cleaning, open and close the battery compart-
ment cover (18). This sets the filter into vibration. Opening
and closing multiple times (up to three times) will improve
cleaning.
You can find a video on manual filter cleaning
via this QR code.
Electrostatic discharge
The friction generated by the dust in the vacuum hose and
accessory during vacuuming causes an electrostatic charge
Bosch Power Tools
that may be perceptible as static discharge (depending on
environmental factors and physiological state).
This dust extractor is fitted with a conductive vacuum
hose (20) as standard.This vacuum hose (20) is electrically
connected to the bag holder (33) via the hose adapter (10).
Therefore, if the vacuum hose (20) comes into contact with
the floor, an electrostatic discharge is possible.
Wet Vacuuming
Do not use the vacuum cleaner to vacuum combustible
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or explosive liquids, such as petrol, oil, alcohol or
solvents. Do not vacuum hot, burning or explosive
dust. Do not operate the vacuum cleaner in areas sub-
ject to explosion hazards. Dust, vapours and liquids can
ignite or explode.
The dust extractor must not be used without a filter.
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Note: When removing and setting down the top part of the
dust extractor (15), make sure that the rods of the bag
holder (33) do not bend or break.
Before Starting Wet Extraction (see figure L)
Empty the container (12) and remove the plastic bag (36).
Press the detents (43) ➊ and remove the bag
holder (33) ➋.
During and after wet vacuuming
The dust extractor is equipped with a float (44). Extraction
is stopped when the maximum filling level is reached. The
container (12) should then be emptied.
Note: If the container (12) is not emptied in a timely man-
ner, the main filter (32) will also become filled with fluid. In
this case, remove the main filter (32) and empty it as well
(see "Cleaning/replacing filters", page 28).
After the work is complete, to prevent the formation of
mould, remove the top part of the dust extractor (15) and
the main filter (32) and allow both components to dry thor-
oughly.
Maintenance and Service
Maintenance and Cleaning
Remove the battery before cleaning or performing
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maintenance on the dust extractor, making tool ad-
justments, changing accessories or placing the dust
extractor in storage. This safety measure prevents the
dust extractor from being started accidentally.
To ensure safe and efficient operation, always keep
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the dust extractor and the ventilation slots clean.
Wear a dust mask when servicing and cleaning the va-
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cuum cleaner.
Do not use compressed air to clean the dust extractor.
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The filter or other components may become damaged.
For the user to carry out maintenance, the dust extractor
needs to be disassembled, cleaned and maintained as far as
this is possible without endangering maintenance personnel
or other persons. Before disassembly, the dust extractor
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1 609 92A 5N0 | (26.09.2023)