Karcher HD 4000 C, HD 6000 C Trouble Shooting, Problem Possible Cause Remedy By whom

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F. Trouble Shooting

HD 4000 C / HD 6000 C

Problem			Possible Cause	Remedy	by whom
High-pressure			Leaking suction-side tubing	Check fastener and hose	Operator
pump fails to			system	connections
come up to			Water starvation	Correct the cause	Operator
pressure
			Defective valve in pump	Replace valves	Customer
			High-pressure solenoid valve		Service
			fails to close
Pronounced pump			Defective dashpot	replace	Operator
knock, pressure			Pump is drawing air	Check suction line	Operator
gauge pointer
oscillates			Defective valve seat or valve	Replace as required	Customer
			spring		Service
With hot-water			Defective or calcified	Check precompression	Operator
accessory kit only			precompression pump	pump
Overflow volume			Blown hose between overflow	replace	Operator
is blown out into			valve and float valve
open, and/or
safety valve is			Defective overflow valve	Repair or exchange	Customer
activated
			CAUTION: For safety reasons,	overflow valve	Service
			excess water is vented
			outdoors.
			Shut down the system!!
Water is returning			System is calcified	Decalcify system circuits	Operator
to float reservoir				(refer to Maintenance
despite full-volume				section)
usage			Defective spray lances and/or	Check spray lances	Operator
			nozzles.
			Defective overflow valve	Check overflow valve	Cust. Service
Overflow valve			Leak in high-pressure system,	Repair leak	Operator
cycles ON and			defective spray gun.
OFF despite zero			Leaking non-return valve or	Repair overflow valve	Customer
usage
			control piston seal in overflow		Service
			valve
Pump does not			Blocked strainer upstream of	Clean strainer	Operator
reach working			solenoid valve
RPM with		and/	Defective pressure relief	Replace solenoid valve	Customer
or	- starter.
			solenoid valve		Service

F1 5.956-648 A10369 (06/98)