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For malfunctions that are not specified in this chapter, when in doubt or when explicitly indicated, seek assist-
ance from an authorized service facility.
Problem
The motor doesn't work.
Motor makes too much
noise.
Motor mildly overheats.
Motor runs. Core bit doesn't
rotate.
Rate of drilling progress
decreases.
Motor cuts out.
Water leakage at the water
swivel or gear housing.
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Troubleshooting
Possible cause
Defective motor.
Defective cable of plug.
Defective switch.
Damaged windings.
The carbon brushes of the machine
are worn.
Motor overload.
Motor doesn't cool sufficiently
Gearing defective.
Core bit segments polished.
Water pressure/water flow rate too
high.
The core is stuck in the core bit.
Maximum drilling depth reached.
Core bit defective.
Gearing defective.
The clutch is releasing prematurely
or slipping.
The core bit has been jammed for
too long.
Electric power failure.
Electronics defective.
Shaft seal defective.
Water pressure is too high.
Possible solution
Contact customer service. Never repair the
motor yourself. Danger!
PRCD protective switch is not switched on,
test!
Have inspected by a electrical specialist and
replaced if necessary.
Contact customer service.
Have the motor inspected by customer
service.
Prevent motor overload when drilling.
Remove the dust from the motor, so that
the cool air can flow.
Have the machine inspected by the service
facility.
Sharpen the core bit on a sharpening plate
while water is flowing.
Use the feed lever to reduce the water flow
rate.
Remove the core..
Remove the core and use a core bit exten-
sion.
Check the core bit for damage and replace
if necessary.
Have the machine repaired at a service
center.
Have the machine repaired at a service
center.
Free the core bit. Switch the motor off and
then on again.
Check the plug connections, electric power
supply and PRCD protective switch.
Have the machine repaired at a service
center.
Have the machine repaired at a service
center.
Reduce the water pressure.
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