Kärcher HD 1.9/15 Ed, Operator'S Manual

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#9.800-085.0 • Rev. 01/08
PRESSURE
W
ASHER
Tr
oub
leshooting Guide
10
TROUbLESHOOTINg
PRObLEM POSSIbLE CAUSE SOLUTION
PUMP RUNNINg
NORMALLy bUT
PRESSURE LOW ON
INSTALLATION Pump sucking air Check water supply and possibility of air.
Check valves sticking Check and clean or replace if necessary.
Unloader valve seat faulty Check and replace if necessary.
Nozzle incorrectly sized Check and replace if necessary.
Worn piston packing Check and replace if necessary.
fLUCTUATINg PRES-
SURE Valves worn Check and replace if necessary.
Blockage in valve Check and replace if necessary.
Pump sucking air Check water supply connections.
Worn piston packing Check and replace if necessary.
Insufficient water Check filter and hose for breakage.
PRESSURE LOW
AfTER PERIOD Of
NORMAL USE
Nozzle worn Check and replace if necessary.
Suction or delivery valves worn Check and replace if necessary.
Suction or delivery lines blocked Check and clean if necessary.
Unloader valve seat worn Check and replace if necessary.
Worn piston packing Check and replace if necessary.
Water temperature excessive Reduce to below 160° F.
PUMP NOISy
Air in suction line Check water supply and connections on suc-
tion line.
Broken or weak suction or delivery valve
spring Check and replace if necessary.
Foreign matter in valves Check and clean if necessary.
Worn bearings Check and replace if necessary.
Excessive temperature of water Reduce to below 160° F.
PRESENCE Of
WATER IN
PUMP OIL Oil seal worn Check and replace if necessary.
High humidity in air Check and replace if necessary.
Piston packing worn Check and replace if necessary.
WATER DRIPPINg
fROM UNDER PUMP Piston packing worn Check and replace if necessary.
O-ring plunger retainer worn Check and replace if necessary.
WATER DRIPPINg
fROM PUMP
PROTECTOR Water supply pressure too high (over
90 PSI) Lower water supply pressure using a regula-
tor.
Spray gun is in the off position for over
5 minutes Turn machine off if not in use for over 5 min-
utes.
OIL DRIPPINg Oil seal worn Check and replace if necessary.
ExCESSIvE
vIbRATION IN HIgH
PRESSURE HOSE Irregular functioning of the pump
valves Check and replace if necessary.
MOTOR DOES
NOT START WHEN
SWITCHED ON Plug not well connected or lack of power
supply Check plug, cable and switch.
WHEN SWITCHINg
ON THE MACHINE,
MOTOR HUMS bUT
DOES NOT RUN Main voltage is insufficient lower than
the minimum required Check to make sure main power supply is
adequate.
The pump is stuck or frozen Check by turning the motor manually.
MOTOR STOPS Tripped thermal overload due to over-
heating Check that main voltage corresponds to the
specifications. Wait a few minutes before turn-
ing on the machine again by resetting the GFCI
cord.