30
Care and maintenance / Troubleshooting
Statutory requirements
The electrical and mechanical safety of the saw system and its accessories such as electric extension cables must
be checked at the specified intervals in accordance with national regulations.
In countries of the European Union, following the provisions of EN 60204-1, the checks listed below are recom-
mended:
■
Measurement of earth / ground conductor resistance (max. 0.3 ohms).
■
Instead of the insulation resistance test in accordance with EN 60204-1, leakage current during operation should
be measured, as this provides a very quick indication of the possibility of an insulation fault.
■
Measurement of earth /ground conductor current (max. 3.5 mA during operation, with the machine placed on
an insulated surface).
■
Functional and visual check of the emergency stop switch, operating controls, indicator lamps, seals, cables,
blade guard and support system in order to detect faults that could present a hazard.
Service intervals
We recommend that the system is checked at a Hilti service center after every 200 operating hours. This will ensure
that the equipment is ready for use when required and help avoid high subsequent costs.
NOTE
The service indicator lights when servicing is necessary.
10. Troubleshooting
The meaning of error codes and the measures to be taken to remedy faults
The electric wall saw is quipped with a fault diagnosis and error display system that allows the operator to local-
ize faults and, as far as possible, to remedy these without assistance.
While doing so, should it be necessary to enter the danger area, all safety instructions, particularly those listed in
Section 5, must be observed.
Should it prove impossible to remedy the fault yourself, you can assist Hilt Service by describing the fault as pre-
cisely as possible and by stating the error code displayed by the remote control unit.
Displayed on remote control
Fault
Possible cause
Recommended measures to
remedy fault
No display
No display on power unit or
Electric supply not connected
– Check the electric supply
remote control unit
or faulty
– Check the plug connections
– Return the remote control and
power unit to Hilti Service
Symbol 11 lights
Er50
Machine has switched itself
Cooling water insufficient or
– Allow to cool with cooling
Er51
off due to overheating
too warm
water flowing / restart
Er52
– Return the saw head to Hilti
Er53
Service
Symbol 11 lights
Er20
Machine cannot be
Temperature sensor in the
– Return the saw head to Hilti
Er21
switched on
saw head is faulty
Service
Symbol 11 lights
Er89
Machine cannot be
Temperature sensor in the
– Return the power unit to Hilti
Er90
switched on
power unit is faulty
Service
Symbol 12 lights
Er54
Warning before cut–out due
Cooling water insufficient or
– Improve the cooling
Er55
to overheating
too warm – power unit is
– Return the power unit to Hilti
Er56
overheating
Service
10.1
9.4
9.3
Printed: 09.03.2015 | Doc-Nr: PUB / 5139344 / 000 / 01
