Troubleshooting - Kärcher K 3.79 M Operator's Manual

TROUBLESHOOTING

Disconnect the machine from the power source before making any repair.
Symptom
Motor will not start.
Unit does not reach high
pressure.
Output pressure varies high
and low.
Cause
On/Off switch is in the "OFF" (O)
position.
Power cord is not plugged in.
Extension cord is too long.
Extension cord is not proper gauge.
Extension cord is damaged.
Electrical outlet does not supply
adequate power.
Diameter of garden hose is too
small.
Water supply is restricted.
Not enough inlet water supply.
Water inlet filter is clogged.
Spray wand is on low pressure
position.
Not enough inlet water supply.
Pump is sucking air.
Water inlet filter is clogged.
Discharge nozzle is obstructed.
Calcified gun, hose or spray wand.
Solution
Turn switch to the "ON" (I) position
Plug in power cord.
Replace extension cord with either
a 25 ft. 12/3 gauge cord or a 50
ft. 10/3 gauge cord.
Try a different outlet.
Replace with a 1/2 inch or 5/8 inch
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 machine and
purge pump by squeezing trigger
gun until a steady flow of water
emerges 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 tank.
11