Troubleshooting - Hilti DD 150?U Operating Instructions Manual

9 Troubleshooting

Fault
The machine doesn't start.
en
The service indicator lights.
The machine doesn't start and
the service indicator lights.
The machine doesn't start,
carbon brushes have been
changed, service indicator
lights.
The machine doesn't run and
the service indicator blinks.
The machine doesn't start, theft
protection indicator blinks yel-
low.
The motor runs. The diamond
core bit doesn't rotate.
Drilling speed drops.
18
Possible cause
Interruption in the electric supply.
On/off switch defective.
Interruption in the electric supply.
The electronics are defective.
Water in the machine.
The carbon brushes are worn; the
machine will continue to run for a few
hours.
The carbon brushes are worn.
A fault has occurred in the power tool.
The machine has overheated.
Overload error.
The power tool has not been un-
locked (tools with optional theft pro-
tection system).
Gear selector doesn't engage.
The gearing is defective.
The diamond core bit is polished.
The diamond core bit is polished.
Water pressure / flow rate too high.
The core is stuck in the core bit.
Maximum drilling depth is reached.
The diamond core bit is defective.
The slip clutch is disengaging prema-
turely or slipping.
The carriage is locked.
Remedy
Plug in another electric appliance and
check whether it works. Check the
plug connections, supply cords and
extension cords, GFCI and electric
supply.
If necessary, the power tool should be
repaired by Hilti Service.
Check the supply cord, extension
cord, supply cord plug, GFCI and
have them replaced by a qualified
electrician if necessary.
The machine should be repaired by
Hilti Service.
Dry the machine.
The machine should be repaired by
Hilti Service.
The carbon brushes should be
changed.
See section: 8.4 Replacing the carbon
brushes 26
Replace the carbon brushes.
See section: 8.4 Replacing the carbon
brushes 26
If necessary, the power tool should be
repaired by Hilti Service.
Wait a few moments until the motor
has cooled down or allow it to run
under no load in order to speed up
the cooling-down process.
Switch the machine off and on again.
Use the TPS key to unlock the power
tool.
Move the gear selector until felt to
engage.
If necessary, the machine should be
repaired by Hilti Service.
Sharpen the diamond core bit on a
sharpening plate with water flowing.
The wrong type of core bit has been
used. Seek advice from Hilti.
Reduce the water flow rate by adjust-
ing the flow regulator.
Remove the core.
Remove the core and use a core bit
extension.
Check the diamond core bit for dam-
age and replace it if necessary.
If necessary, the machine should be
repaired by Hilti Service.
Unlock the carriage.