Unit Switches On And Off Continuously - Kärcher HD 1090 Service Handbook

Troubleshooting and basic settings

Unit switches on and off continuously

Servopress handgun disassembled
Water leak between high-pressure hose and O-ring
150 200
100
250
50
0 300
bar
Remove pressure holding valve
Servopress handgun leaking
– Disassemble the handgun and check all com-
ponents for any malfunction. Replace defecti-
ve parts if necessary.
– Lubricate all O-rings and empty spaces in the
union piece with anti-seize, copper grease
compound.
High-pressure screwed connections leaking
– Check all O-rings and seals between the cylin-
der head connection and the handgun. If
necessary replace defective parts.
Water leak at the cylinder head
– Check all O-rings, screwed connections and
seals at the cylinder head. If necessary repla-
ce defective parts.
Pressure holding valve leaking
– Remove threaded plug and pressure holding
valve, check for leakage. Replace defective
parts if necessary.
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