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▶ After a long period of storage, always check all visible parts and controls for signs of damage and make
sure that they all function correctly.
9
Troubleshooting
If the trouble you are experiencing is not listed in this table or you are unable to remedy the problem by
yourself, please contact Hilti Service.
9.1
The diamond core drilling machine is in working order
Malfunction
Restart interlock
Overheating
Remaining running time un-
til the carbon brushes are
changed.
22
English
Possible cause
Switch of the power tool is in I
position while connection to the
power supply being established.
The diamond core drilling machine
has been overloaded
Maximum running time with hole-
starting mode activated exceeded.
Water in the motor.
Supply network fault – the power
supply has been interrupted.
The motor has overheated. The
cooling down process is complete.
The motor has overheated. The
diamond core drilling machine is
running in cooling mode.
The carbon brush wear limit has
almost been reached. The diamond
core drilling machine will continue
to run for a few hours until it shuts
down automatically.
Action to be taken
▶ Switch the diamond core drilling
machine off and then on again.
▶ Switch the diamond core drilling
machine off and then on again.
▶ Do not overload the diamond
core drilling machine (e.g. by
repeated disengagement of the
slip clutch).
▶ Switch the diamond core drilling
machine off and then on again.
▶ Allow the diamond core drilling
machine to dry out completely
in a warm, dry place.
▶ Switch the diamond core drilling
machine off and then on again.
▶ Check whether other power
consumers are disrupting the
power supply from the network
or generator.
▶ Check the length of the exten-
sion cord used.
▶ Switch the diamond core drilling
machine off and then on again.
▶ Switch the diamond core drilling
machine off and then on again.
▶ Wait a few minutes until the
motor has cooled down or
allow the diamond core drilling
machine to run under no load
in order to speed up the
cooling process. When normal
temperature is reached, the
indicator goes out and the
diamond core drilling machine
switches to restart interlock.
Switch the diamond core drilling
machine off and then on again.
▶ Have the carbon brushes
replaced at the next opportunity.
2279864
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