Troubleshooting - Hilti TE 70-D/AVR Operating Instructions Manual

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
en

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 achieve
full power.
The drill bit doesn't rotate (only
combihammers).
The drill bit/chisel can not be
released from the unlocking
device.
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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 ac-
tivated after an interruption in the
electric supply.
The power tool is too cold.
A fault has occurred in the power tool.
The carbon brushes are worn.
The extension cord is too long or its
gauge is inadequate.
The control switch is not pressed
fully.
The reduced-power button is en-
gaged (depends on version).
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.
The side handle is not fitted correctly.
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. Release the control switch
lock.
Allow the power tool to warm up to
the minimum operating temperature.
See section: 7.2.1 Hammer drilling 6
If necessary, the power tool should be
repaired by Hilti Service.
Have it checked by a trained electrical
specialist and replaced if necessary.
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.
Move the function selector switch to
the "Hammer drilling" position when
the motor has stopped.
Pull the insert tool unlocking device
back as far as it will go and remove
the insert tool.
Release the side handle and refit
it correctly so that the clamping
band and side handle engage in the
groove.