Troubleshooting - Kärcher K 3.99 M Operator's Manual

CAUTION
Disconnect the machine from the power
source before making any repair.
Symptom
Motor will not start
Unit does not reach
high pressure.
Output pressure va-
ries high and low.

Troubleshooting

Cause
On/Off switch is in the "OFF"
(O) position.
Power cord is not plugged in. Plug in power cord.
Electrical outlet does not
supply adequate power.
Tripped circuit breaker.
Diameter of garden hose is
too small.
Water supply is restricted.
Not enough inlet water supp-
ly.
Water inlet filter is clogged.
Spray wand is on low pres-
sure position.
Not enough inlet water supp-
ly.
Pump is sucking air.
Water inlet filter is clogged.
Discharge nozzle is obstruc-
ted.
Calcified gun, hose or spray
wand.
Solution
Turn switch to the "ON" (I)
position
Try a different outlet.
Switch off pressure washer.
GFCI will reset once the tem-
perature of the unit drops.
Replace with a 5/8 inch or
larger garden hose.
Check garden hose for
kinks, leaks and blockage.
Open water source full force.
Remove filter and rinse out
in warm water.
Turn spray wand to high
pressure position.
Turn water on full force.
Check garden hose for
kinks, leaks or blockage.
Check that hoses and fittings
are air tight. Turn off machi-
ne and purge pump by
squeezing trigger gun until a
steady flow of water emer-
ges through the nozzle.
Remove filter and rinse out
in warm water.
Blow out or remove debris
with a fine needle.
Run distilled vinegar through
detergent suction tube.
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