Motor cuts out.
Water leakage at the
water swivel or gear
housing.
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.
Free the core bit. Switch the motor off
and then on again.
Check the plug connections, electric
power supply and PRCD protective
switch.
Check power 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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