Karcher K120 M - Manual (Page 11)

10
TROUBLESHOOTING
Disconnect the machine from the power source before making any repair.
Symptom Cause Solution
Motor will not start
Unit does not reach
high pressure.
Output pressure
varies high and low.
Extension cord is too long.
Extension cord is not proper
gauge.
Extension cord is damaged. Replace extension cord with either
a 25 ft. 12/2 gauge cord or a 50 ft.
10/2 gauge cord.
Electrical outlet does not
supply adequate power. Try a different outlet.
Tripped circuit breaker Reset breaker (power supply) or
ground fault circuit interrupter.
Diameter of garden hose is
too small. Replace with a 3/4 inch garden
hose.
Water supply is restricted. Check garden hose for kinks, leaks
and blockage.
Not enough inlet water supply. Open water source full force.
Water inlet filter is clogged. Remove filter and rinse out in warm
water.
Not enough inlet water supply. Turn water on full force. Check garden
hose for kinks, leaks or blockage.
Pump is sucking air. Check that hoses and fittings are air
tight. Turn off machine and purge
pump by squeezing trigger gun until
a steady flow of water emerges
through the nozzle.
Water inlet filter is clogged. Remove filter and rinse out in warm
water.
Discharge nozzle is
obstructed. Blow out or remove debris with a
fine needle.
Calcified gun, hose or spray
wand. Run distilled vinegar through
detergent suction tube.
On/Off switch is in the
“OFF” position. Turn switch to the “ON” position
Power cord is not plugged in. Plug in power cord.
Soap nozzle installed. Remove soap nozzle and connect
spray wand.