Symptom

Cause

Solution

No detergent.

Detergent suction tube not

Check connection.

 

properly connected to the

 

 

machine.

 

 

Detergent is too thick.

Dilute detergent, for best re-

 

 

sults use Kärcher® detergent.

 

Filter on detergent suction

Run warm water through filter

 

tube is clogged.

to remove debris.

 

Damaged or clogged deter-

Remove obstruction or replace

 

gent suction tube.

detergent suction tube.

 

Spray wand is in high pres-

Turn spray wand tip to low

 

sure position.

pressure position.

 

Discharge nozzle is obstruct-

Blow out or remove debris with

 

ed.

fine needle.

Garden hose con-

Loose fittings.

Tighten fittings.

nection leaks.

 

 

Missing/worn rubber washer.

Insert new washer.

Spray wand leaks.

Spray wand not properly at-

Insert the spray wand into the

 

tached.

trigger gun. Carefully press in

 

 

against the spring tension and

 

 

twist into the locked position.

 

Broken o-ring or plastic in-

Call Customer Support

 

sert.

 

Pump is noisy.

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 leaks from

Loose fittings.

Check that all fittings are tight.

pump (up to 10

 

 

Water seals are damaged or

Call Customer Support

drops per minute

worn.

 

is permissible).

 

 

Oil Drip.

Oil seals are damaged or

Call Customer Support

 

worn.

 

If you encounter any additional difficul- ties not listed, please visit our website.

USA / Canada:

www.karcher-help.com

México:

www.karcher.com.mx

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Karcher K 3.740 manuel dutilisation Symptom Cause Solution, USA / Canada México