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Troubleshooting - Kärcher HD 2.0/1000 Ed Service Manual

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PROBLEM
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW ON
INSTALLATION
FLUCTUATING
PRESSURE
PRESSURE LOW AFTER
PERIOD OF NORMAL
USE
PUMP NOISY
PRESENCE OF WATER
IN PUMP OIL
WATER DRIPPING FROM
UNDER PUMP
WATER DRIPPING FROM
PUMP PROTECTOR
OIL DRIPPING
EXCESSIVE VIBRATION
IN HIGH PRESSURE
HOSE
MOTOR DOES
NOT START WHEN
SWITCHED ON
WHEN SWITCHING ON
THE MACHINE, MOTOR
HUMS BUT DOES NOT
RUN
MOTOR STOPS
24

TROUBLESHOOTING

POSSIBLE CAUSE
Pump sucking air
Check valves sticking
Unloader valve seat faulty
Nozzle incorrectly sized
Worn piston packing
Valves worn
Blockage in valve
Pump sucking air
Worn piston packing
Insufficient water
Nozzle worn
Suction or delivery valves worn
Suction or delivery lines blocked
Unloader valve seat worn
Worn piston packing
Water temperature excessive
Air in suction line
Broken or weak suction or delivery
valve spring
Foreign matter in valves
Worn bearings
Excessive temperature of water
Oil seal worn
High humidity in air
Piston packing worn
Piston packing worn
O-ring plunger retainer worn
Water supply pressure too high (over
90 PSI)
Spray gun is in the off position for over
5 minutes
Oil seal worn
Irregular functioning of the pump
valves
Plug not well connected or lack of
power supply
Main voltage is insufficient, lower than
the minimum required
The pump is stuck or frozen
Tripped thermal overload due to over-
heating
9.801-811.0 • Rev. 06/17
SOLUTION
Check water supply and possibility of air seepage.
Check and clean or replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check water supply connections.
Check and replace if necessary.
Check filter and hose for breakage.
Check and replace if necessary.
Check and replace if necessary.
Check and clean if necessary.
Check and replace if necessary.
Check and replace if necessary.
Reduce to below 160
F.
o
Check water supply and connections on suction
line.
Check and replace if necessary.
Check and clean if necessary.
Check and replace if necessary.
Reduce to below 160
F.
o
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Lower water supply pressure using a regulator.
Turn machine off if not in use for over 1-2 minutes.
Check and replace if necessary.
Check and replace if necessary.
Check plug, cable and switch.
Check to make sure main power supply is ad-
equate.
Check by turning the motor manually.
Check that main voltage corresponds to the speci-
fications. Wait a few minutes before turning on the
machine again by resetting the GFCI cord.

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