Troubleshooting - Kärcher HD 1090 Safety Instructions

Disconnect the appliance from the power mains before all repair work.
Only authorized customer service personnel may inspect electrical components.
In this chapter, we would like to give you some
hints on dealing with malfunctions yourself.
In all other cases or in the case of electrical faults,
please contact the authorized customer service.
4.1 Unit does not start
Check mains voltage.
Check connection cables for damage.
If the motor has overheated, allow the unit to
cool down. Then switch on again with the unit
switch.
Contact customer service if there is an
electrical malfunction.
4.2 Unit does not reach operating
pressure
Set three-way nozzle to "High Pressure".
Clean/replace three-way nozzle.
Clean sieve in the water connection.
Deaerate the unit.
Check water supply flow rate.
(see Technical Data)
Check all pump supply lines for leaks or
blockages.
Contact customer service if required.

4. Troubleshooting

4.3 Pump Leaks
4.4 Pump knocks
4.5 No detergent intake
3 drops per minute are permissible. In the
case of more serious leakage, you should
contact the authorized customer service.
Check all supply lines, even the detergent
system, for leaks.
Deaerate unit.
Contact customer service if required.
Set three-way nozzle to "Low Pressure".
Check detergent intake hose and filter for
leaks or blockages and clean.
Clean/replace the check valve at detergent
intake-hose connection.
Clean the non-return valve on the pump head
and the connection for the detergent suction
hose.
Contact customer service if required.
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