8.2 Maintenance
WARNING
Do not operate the tool if parts are damaged or
when the controls do not function faultlessly. Have
the power tool repaired by Hilti Service.
WARNING
Repairs to the electrical section of the power tool
may be carried out only by trained electrical spe-
cialists.
Check all external parts of the power tool for damage
at regular intervals and check that all controls operate
faultlessly.
8.3 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 battery runs down more
quickly than usual.
Battery condition is not optimal.
Have battery condition diagnosed
by Hilti Service or replace with a
new battery.
The battery doesn’t engage
with an audible 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.
LED 1 blinks
The battery is discharged.
Charge the battery.
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 power tool doesn’t run
and 1 LED blinks.
The battery is discharged.
Change the battery and recharge
the discharged battery.
The battery is too hot or too cold.
Bring the battery to the recommen-
ded working temperature.
The power tool doesn’t work
and all 4 LEDs blink.
The power tool has been over-
loaded briefly.
Release the switch and press it
again.
The overheating prevention cut-out
has been activated.
Allow the power tool to cool down.
The battery becomes too hot
to touch.
The battery cells are defective.
Place the tool in non-flammable
surroundings (at least 3 meters
away from flammable materials)
where it can be kept under obser-
vation and allow it to cool down. If
necessary, extinguish flames with
cold water or allow it to burn under
supervision. Contact Hilti Service.
The power tool doesn’t
achieve full power.
A battery with inadequate capacity
was used.
Use a battery with a capacity of at
least 2.6 Ah.
en
36
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