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ZE/ZEF-ET-HD-HE • 8.914-001.0 • 8.941-457.0 • 9.800-088.0 • 8.919-017.0 • Rev. 04/19
11
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW ON
INSTALLATION
Pump sucking air
Check water supply and possibility of air seep-
age.
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
PRESSURE
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/clogging
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 package Check and replace if necessary.
Water temperature excessive Reduce to below 140
o
F.
PUMP NOISY
Air in suction line Check water supply and connections on suction
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.
Water temperature excessive Reduce to below 160
o
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 regulator.
Spray gun is in the off position for over
1-2 minutes
Turn machine off if not in use for over 1-2 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 specifica-
tions for the machine. Wait a few minutes before
turning on the machine again by resetting the
GFCI on the cord.
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