15
9. Troubleshooting
Fault
Possible cause
Remedy
Tool doesn‘t run
Battery is discharged or not correctly Refit the battery. It must be heard
fitted
to engage with an audible "click".
Charge the battery if necessary.
Electrical fault
Remove the battery and contact
your nearest Hilti service center.
Tool runs too fast / too slow
Speed selector in wrong position
Move the speed selector switch to
the desired position.
No hammering action
Tool set to the wrong mode
Set the tool to hammering
mode.
Clutch releases while drilling
Tool set to screwdriving mode
Set the tool to drilling mode.
On / off switch cannot be pressed
Forward / reverse switch is set to
Move the forward / reverse switch
middle position
to the left/right.
Speed suddenly drops
The battery is almost exhausted.
Stop working with the exhausted
battery and charge it fully.
Battery becomes discharged
Battery condition is not optimal.
Charge the battery using condi-
faster than usual
tioning mode (see battery charger
operating instructions).
Battery does not engage with an
Dirt on battery locking mechanism
Clean battery locking mechanism
audible "click"
and refit the battery. Contact your
nearest Hilti service center if the
problem persists.
Tool or battery overheats
Electrical fault
Switch off the tool immediately.
Remove the battery and contact
your nearest Hilti service center.
Overload due to exceeding application Select the right tool for the appli-
limit
cation.
Drill bit or screw gets stuck
Release the drill bit or screw.
Drill bit or screwdriving bit slips
Chuck not tightened correctly
Tighten the chuck securely by
in the chuck
applying reasonable force.
Printed: 07.07.2013 | Doc-Nr: PUB / 5070671 / 000 / 00