Check all external parts of the power tool for damage
at regular intervals and check that all controls operate
faultlessly. Do not operate the power tool if parts
are damaged or when the controls do not function
faultlessly. If necessary, the power tool should be
repaired by Hilti Service.
8.7 Checking the power tool after care and
maintenance
After carrying out care and maintenance work on
the power tool, check that all protective and safety
devices are fitted and that they function faultlessly.
9. Troubleshooting
Fault
Possible cause
Remedy
The power tool doesn’t run.
The battery is discharged or fitted
incorrectly.
The battery needs to be charged or,
respectively, it must be heard to
engage with a double click.
Electrical fault.
Remove the battery from the power
tool and contact Hilti.
The battery is too hot or too cold.
Bring the battery to the recommen-
ded working temperature.
No hammering action.
The power tool is too cold.
Allow the power tool to warm
up to the minimum operating
temperature.
See section: 6.1 Battery use and
care
The function selector switch is set
to “Drilling without hammering”.
Set the function selector switch to
“Hammer drilling”.
The forward/reverse switch is set to
reverse rotation.
Set the forward/reverse switch to
forward rotation.
The control switch can’t be
pressed, i.e. the switch is
locked.
The forward / reverse switch is in
the middle position (transport lock
engaged).
Push the forward / reverse switch
to the left or right.
Running speed suddenly
drops considerably.
The battery is discharged.
Change the battery and recharge the
discharged battery.
The battery runs down more
quickly than usual.
Battery condition is not optimal.
Have the battery condition checked
by Hilti or replace the battery.
The battery doesn’t engage
with an audible double click.
The retaining lugs on the battery are
dirty.
Clean the retaining lugs and check
that the battery engages securely.
Contact Hilti Service if the problem
persists.
The power tool or the battery
gets very warm.
Electrical fault.
Switch the power tool off imme-
diately, remove the battery and
contact Hilti Service.
The power tool has been overloaded
(application limits exceeded).
Use the right power tool for the job
(don’t use a low-powered tool for
heavy work).
The drill bit doesn’t rotate.
The function selector switch is not
engaged or is set to “Chiseling” or
“Chisel adjustment”.
When the motor has stopped, move
the function control switch to the
“Drilling without hammering” or
“Hammer drilling” position.
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