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17 Troubleshooting Guide
17 Troubleshooting Guide
17.1 Pressure Washer
Before troubleshooting, switch off the pressure washer and disconnect the unit from the power supply. Relieve all system
Condition
The pressure washer does
not start although the spray
gun trigger is pulled.
The pressure washer does
not start when switched on.
The electric motor hums.
The pressure washer
switches off while in
operation.
The high-pressure pump
repeatedly switches on and
off without pulling the spray
gun trigger.
The water pressure
fluctuates or drops.
The shape of the water jet
has changed.
0458-001-8221-A
pressure by pulling the trigger switch. Lock the spray gun trigger.
Possible Cause
The power supply cord is not connected
to an electrical outlet.
The electric motor is too warm.
The mains voltage is too low.
The power supply cord is not connected
to an electrical outlet.
The electric motor is too warm.
There is a leak in the high-pressure
pump, high-pressure hose or spray
attachment.
There is not enough water.
The nozzle is blocked.
The water intake screen or water filter is
blocked.
The high-pressure pump, high-pressure
hose or spray attachment is leaking or
faulty.
The nozzle is blocked.
Remedy
► Connect the power supply cord to a properly
installed electrical outlet.
► Allow the pressure washer to cool at ambient
temperatures for approximately 5 minutes.
► Clean the nozzle, @ 15.2.
► Pull and hold the spray gun trigger and switch on
the pressure washer.
► Switch off other loads connected to the same
electrical circuit.
► Connect the power supply cord to a properly
installed electrical outlet.
► Allow the pressure washer to cool at ambient
temperatures for approximately 5 minutes.
► Clean the nozzle, @ 15.2.
► Have the pressure washer inspected and
repaired by an authorized STIHL servicing
dealer.
► Open the water tap fully.
► Make sure that a sufficient quantity of water is
available.
► Clean the nozzle, @ 15.2.
► Clean water intake screen and water filter,
@ 15.3 and @ 15.4.
► Ask a STIHL servicing dealer to inspect the
pressure washer.
► Clean the nozzle, @ 15.2.
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