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For malfunctions that are not specified in this chapter, when in doubt or when explicitly indicated, seek assis-
tance 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.
18
Troubleshooting
Possible cause
Defective cable of plug.
Defective switch.
The carbon brushes of the
machine are worn.
Defective motor.
Damaged windings.
The carbon brushes of the
machine are almost 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.
Too low power supply.
Electronics defective.
Shaft seal defective.
Water pressure is too high.
Possible solution
PRCD protective switch is not switched on, test!
Have inspected by a electrical specialist
and replaced if necessary.
Contact customer service.
Contact customer service.
Contact customer service. Never repair the
motor yourself. Danger!
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
extension.
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.
Check voltage supply.
Too long/thin extension cord.
Too small aggregate.
Have the machine repaired at a service center.
Have the machine repaired at a service center.
Reduce the water pressure.
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