Troubleshooting - Hilti DCH 300 Operating Instructions Manual

The outer casing of the motor and the grips are made
from impact‐resistant plastic. Parts of the grips have
a synthetic rubber covering.
Never operate the power tool when the ventilation
slots are blocked. Clean the ventilation slots carefully
using a dry brush. Do not permit foreign objects to
enter the interior of the power tool. Clean the outside
8.2 Service indicator
NOTE
The power tool is equipped with a service indicator.
LED indicators Constant red light
Blinking red light
8.3 Maintenance
WARNING
Repairs to the electrical section of the machine 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

9. Troubleshooting

Fault
The power tool doesn't start.
of the power tool at regular intervals with a slightly
damp cloth. Do not use a spray, steam pressure
cleaning equipment or running water for cleaning.
This may negatively affect the electrical safety of the
power tool. Always keep the grip surfaces of the
power tool free from oil and grease. Do not use
cleaning agents which contain silicone.
End of service interval ‐ servicing is due. After the
lamp lights for the first time, the power tool may
continue to be used for several hours (switched‐on
running time) before the automatic cut‐out is
activated. To ensure that the power tool is always
ready for use, it should be returned to Hilti for
servicing in good time.
See section "Troubleshooting".
are damaged or when the controls do not function
faultlessly. If necessary, the power tool should be
repaired by Hilti Service.
8.4 Checking the power tool after care and
maintenance
After carrying out care and maintenance, 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. Have checked by a trained electrical
The power tool has not been
unlocked (tools with optional theft
protection system).
The on / off switch is defective.
The power tool has been overloaded
(application limits exceeded).
The overheating protection system
is active.
Remedy
Plug in another electric appliance
and check whether it works.
specialist and replaced if necessary.
Use the TPS key to unlock the power
tool.
If necessary, the power tool should
be repaired by Hilti Service.
Use the right power tool for the job
(don't use a low‐powered tool for
heavy work).
Allow the power tool to cool down.
Clean the ventilation slots.
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