Trouble Shooting - Kärcher HD 4000 C Manual Del Usuario

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Problem
High-pressure
pump fails to
come up to
pressure
Pronounced pump
knock, pressure
gauge pointer
oscillates
With hot-water
accessory kit only
Overflow volume
is blown out into
open, and/or
safety valve is
activated
Water is returning
to float reservoir
despite full-volume
usage
Overflow valve
cycles ON and
OFF despite zero
usage
Pump does not
reach working
RPM with and/
or - starter.
F1
F. Trouble Shooting
Possible Cause
Leaking suction-side tubing
system
Water starvation
Defective valve in pump
High-pressure solenoid valve
fails to close
Defective dashpot
Pump is drawing air
Defective valve seat or valve
spring
Defective or calcified
precompression pump
Blown hose between overflow
valve and float valve
Defective overflow valve
CAUTION: For safety reasons,
excess water is vented
outdoors.
Shut down the system!!
System is calcified
Defective spray lances and/or
nozzles.
Defective overflow valve
Leak in high-pressure system,
defective spray gun.
Leaking non-return valve or
control piston seal in overflow
valve
Blocked strainer upstream of
solenoid valve
Defective pressure relief
solenoid valve
HD 4000 C / HD 6000 C
Remedy
Check fastener and hose
connections
Correct the cause
Replace valves
replace
Check suction line
Replace as required
Check precompression
pump
replace
Repair or exchange
overflow valve
Decalcify system circuits
(refer to Maintenance
section)
Check spray lances
Check overflow valve
Repair leak
Repair overflow valve
Clean strainer
Replace solenoid valve
5.956-648 A10369 (06/98)
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