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Fault
Possible cause
Remedy
The machine doesn’t start.
Interruption in the electric supply.
Check the supply cord and vacuum
cleaner (if applicable), the extension
cord, supply cord plug and PRCD,
and have them replaced by a qualified
electrician if necessary.
The electronics are defective.
The machine should be repaired by
Hilti Service.
The machine doesn’t start and
the service indicator lights.
The carbon brushes are worn.
Replace the carbon brushes.
See section: 8.4 Replacing the carbon
brushes
7
The machine doesn’t start,
carbon brushes have been
changed, service indicator
lights.
A fault has occurred in the power tool. If necessary, the power tool should be
repaired by Hilti Service.
The service indicator lights.
The carbon brushes are worn; the
machine will continue to run for a few
hours.
The carbon brushes should be
changed.
See section: 8.4 Replacing the carbon
brushes
7
The service indicator blinks.
Motor speed error.
Have the appliance repaired by Hilti
Service.
The machine doesn’t start, theft
protection indicator blinks yel-
low.
The power tool has not been un-
locked (tools with optional theft pro-
tection system).
Use the TPS key to unlock the power
tool.
The motor runs. The diamond
core bit doesn’t rotate.
Gear selector doesn’t engage.
Move the gear selector until felt to
engage.
The gearing is defective.
The machine should be repaired by
Hilti Service.
The rate of drilling progress de-
creases.
The diamond core bit is polished.
Sharpen the core bit by drilling into a
sharpening plate.
The diamond core bit is polished.
The wrong type of core bit has been
used. Seek advice from Hilti.
The core is stuck in the core bit.
Remove the core.
Maximum drilling depth is reached.
Remove the core and use a core bit
extension.
The diamond core bit is damaged.
Check the diamond core bit for dam-
age and replace it if necessary.
The slip clutch is disengaging prema-
turely or slipping.
The machine should be repaired by
Hilti Service.
Drilling progress is prevented by an
accumulation of dust.
Use a suitable vacuum cleaner.
The diamond core bit cannot be
fitted into the chuck.
The core bit connection end or chuck
is dirty or damaged.
Clean the connection end /chuck or
replace if necessary.
Excessive play in the drilling
system.
The core bit is not screwed securely
into the chuck.
Tighten it securely.
The core bit connection end is defect-
ive.
Check the connection end and re-
place it if necessary.
en
13
Printed: 16.05.2014 | Doc-Nr: PUB / 5069512 / 000 / 03