Troubleshooting And Basic Settings; Unit Does Not Run - Kärcher HD 1090 Service Handbook

Troubleshooting and basic settings

Unit does not run

Check mains voltage
Measure current consumption
Check unit switch
16
L L L
1 2 3
L L L
1 2 3
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.