Hilti GX 120-ME, Operating Instructions Manual, Page: 28 / 259

Fault Possible cause Remedy
The tool doesn’t fire. The gas can is empty. Check the gas level by pressing the
button marked GAS.
If only 1 LED lights red constantly, the
gas can is empty. Fit a new gas can.
See section: 7.2 Gas level indicator.
No gas can fitted or wrong type of
gas can fitted to the tool.
Open the gas can compartment cover
and check the contents.
If a gas can is present in the tool,
press the button marked GAS.
If 1 LED lights red constantly, the
wrong type of gas can has been in-
serted in the tool. Insert the correct
type of gas can.
See section: 7.2 Gas level indicator.
New gas can fitted, but the tool has
not been pressed against the working
surface 3 times without pulling the
trigger.
Press the tool against the working
surface 3 times without pulling the
trigger.
Foreign object in the tool nosepiece
section.
Remove the magazine and nosepiece
and then remove the foreign object
from the tool.
See section: 7.3.1 Removing the
magazine
7
See section: 7.4.1 Removing the
nosepiece
9
The tool is too hot. Allow the tool to cool down.
Contact Hilti if the problem persists.
When hot, the tool doesn’t fire
after a pause between use.
The fastener driving rate was consid-
erably higher than 1200 per hour and
the gas can is almost empty.
Remove the gas can and then refit it.
Then press the tool against the work-
ing surface 3 times without firing it.
Check the gas level indicator. If the
LED lights red constantly, the gas can
is empty. Fit a new gas can.
Allow the tool to cool down.
Observe the maximum fastener driv-
ing rate (1200 per hour).
Contact Hilti if the problem persists.
The tool doesn’t fire or fires
sporadically.
Operation outside the limits of the
permissible ambient conditions.
If possible, take measures to ensure
that the ambient conditions in the
working environment remain within
the permissible limits.
Use a different fastening technique.
The gas can is not at the operating
temperature.
Bring the gas can to the operating
temperature (-5°C to 45°C with
GC 21, -10°C to 45°C with GC 22).
Gas bubbles have formed in the gas
injection system.
Remove the gas can and then refit it.
The tool is not lifted away completely
from the working surface.
Take care to ensure that the tool is lif-
ted away completely from the working
surface after driving each fastener.
en
24
Printed: 28.11.2013 | Doc-Nr: PUB / 5069877 / 000 / 02