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8.4 Maintenance
WARNING
Repairs to the electrical section of the power tool may
be carried out only by trained electrical specialists.
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
9 Troubleshooting
Fault
The power tool doesn't start.
No hammering action.
The power tool doesn't start
and the LED blinks red.
The power tool doesn't start
and the LED lights red.
The power tool doesn't start
and the indicator lamp blinks
yellow.
The power tool doesn't achieve
full power.
The drill bit doesn't rotate.
The drill bit / chisel can't be re-
leased from the chuck.
damaged or when the controls do not function faultlessly.
If necessary, the power tool should be repaired by Hilti
Service.
8.5 Checking the power tool after care and
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.
Possible cause
Interruption in the electric supply.
The supply cord or plug is defective.
Generator with sleep mode.
Other electrical fault.
The electronic restart interlock is acti-
vated after an interruption in the elec-
tric supply.
The control switch is defective.
The power tool is too cold.
The function selector switch is set to
"Drilling without hammering".
A fault has occurred in the power tool.
The carbon brushes are worn.
The power tool has not been un-
locked (power tools with optional theft
protection system).
The extension cord is too long or its
gauge is inadequate.
The control switch is not pressed
fully.
The "Reduced power" (50% power)
button is engaged.
The voltage provided by the electric
supply is too low.
The function selector switch is not
engaged or is in the "Chiseling" or
"Chisel adjustment" position.
The chuck is not pulled back fully.
maintenance
Remedy
Plug in another electric appliance and
check whether it works.
Have it checked by a trained electrical
specialist and replaced if necessary.
Apply a load to the generator by con-
necting another appliance (e.g. a
lamp). Subsequently switch the power
tool off and on again.
Have it checked by a trained electrical
specialist.
Switch the power tool off and on
again.
Have it checked by a trained electrical
specialist and replaced if necessary.
Allow the power tool to warm up to
the minimum operating temperature.
See section: 7.2.2 Hammer drilling 6
Set the function selector switch to
"Hammer drilling".
If necessary, the power tool should be
repaired by Hilti Service.
Have it checked by a trained electrical
specialist and replaced if necessary.
Use the TPS key to unlock the power
tool.
Use an extension cord of an
approved length and / or of adequate
gauge.
Press the control switch as far as it
will go.
Press the "Reduced power" button.
Connect the power tool to a different
power source.
When the motor has stopped, move
the function control switch to the
"Drilling without hammering" or
"Hammer drilling" position.
Pull the chuck back as far as it will go
and remove the insert tool.
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