![background image](http://html2.mh-extra.com/html/karcher/hd-1090/hd-1090_service-handbook_3833971018.webp)
16
Troubleshooting and basic settings
Unit does not run
Check unit switch
Measure current consumption
Check mains voltage
Electrical connection defective
– The voltage indicated on the rating plate must
coincide with the mains voltage.
– Check voltage at the socket outlet (all 3 pha-
ses).
– Check main fuse.
Note:
Do not repair any domestic installations
(sockets, etc.) This should only be done by
a qualified electrician.
Extension cable
– The extension cable must always be fully
unwound from the cable drum.
Cable cross-section:
min. 1.5 mm² with up to 10 m in length
min. 2.5 mm² from 10 m to 30 m in length
Motor and unit switch defective
– The unit switch has a built-in thermal overload
trip. If the overload trip has triggered several
times, measure the current consumption un-
der full load at all 3 phases (see technical
data). Replace defective parts if necessary.
An excessive power consumption may be
caused by the following:
– defective motor winding
– defective connecting cable
– extension cord
– fluctuating supply voltage
– If the electric motor is replaced, the unit switch
and pressure switch must also always be
renewed.
– Disconnect the unit from the mains and, with
the unit switch on, measure the electrical
resistance between the connecting terminals
(inlet-outlet).
The desired value must be zero Ohms.
L
1
L
2
L
3
L
1
L
2
L
3
Summary of Contents for HD 1090
Page 1: ...HD 1090 Service Handbook 0 I 5 905 212 03 02...
Page 4: ...2 Unit function Equipment 10 15 12 9 10 13 11 14 16 1 8 2 3 4 5 6 7 0 I...
Page 6: ...4 Unit function Functional diagram 5 3 7 8 9 10 11 12 13 14 2 1 15 16 17 4 6...
Page 8: ...6 Unit function Pump 15 17 18 10 12 13 11 14 16 20 9 12 11 1 8 2 3 4 5 6 7 11 19 21...
Page 10: ...8 Unit function Pressure and flow control with the Servopress handgun 1 2 4 3...
Page 14: ...12 Unit function Handgun with pressure and flow control Servopress with low effort version...