8
9. Troubleshooting
9.1 Explanation of the operating status / service indicator lamps
The tool is equipped with two lamps which indicate its operating status or faults by lighting in different ways:
Fault indicator
Ready and
Tool status
Cause / action required
(red lamp)
service indicator
(green lamp)
Off
Off
The tool is not ready.
No electric power.
See “Troubleshooting”
Off
Lights
The tool is ready for operation.
Lights
Lights
The tool has overheated.
The tool has switched itself off.
The red lamp remains lit until the
tool has cooled down.
The tool does not restart automati-
cally after cooling down (switch
must be operated).
Blinks
Lights
Fault in the tool or electric supply
The tool has switched itself off.
voltage.
See “Troubleshooting”
Off
Blinks
Servicing is due.
Have the tool serviced at a Hilti
service center.
9.2 Troubeshooting
Fault
Possible cause
Remedy
The tool doesn’t start and the green
No voltage from the electric supply.
Plug in another tool (TE MD20 MSHA)
ready indicator doesn’t light.
and check that it works. Check the
electric supply (fuse, circuit break-
er).
Have repairs carried out by a
skilled electrical specialist.
Fault or poor contact in the extension Replace the extension cord and
cord or plug connectors.
check whether the tool works.
Return defective parts to Hilti
Service.
The tool doesn’t start and the fault
The tool has overheated.
Check the water supply. Allow the
indicator (red lamp) lights.
tool to cool down. The tool is ready
for further use when the red lamp
no longer lights.
The tool doesn’t start and the fault
The tool is faulty or an internal
Switch the tool off and then on
indicator (red lamp) blinks.
safety function has been activated.
again (reset). If the fault persists:
●
Plug in another tool
(TE MD20 MSHA) and check that
it works.
●
Have the electric supply voltage
checked (overvoltage, undervolt-
age).
Have repairs carried out by
a skilled electrical specialist.
●
If the other tool works, return the
faulty tool to Hilti for repair.
The connection end is broken off in
1. Disconnect the tool from the
the chuck.
electric supply.
2. Open the locking mechanism.
3. Remove the broken piece of the
connection end.
Printed: 20.04.2017 | Doc-Nr: PUB / 5136192 / 000 / 00
Printed: 20.04.2017 | Doc-Nr: PUB / 5136192 / 000 / 01