TROUBLESHOOTING

Disconnect the machine from the power source before making any repair.

Symptom

Cause

Solution

 

 

 

Motor will not start

On/Off switch is in the “OFF” (O)

Turn switch to the “ON” (I) position

 

position.

 

 

 

 

 

Power cord is not plugged in.

Plug in power cord.

 

 

 

 

Extension cord is too long.

Replace extension cord with either

 

Extension cord is not proper gauge.

“a 25 ft. 12/3 gauge cord or a 50

 

Extension cord is damaged.

ft. 10/3 gauge cord.

 

 

 

 

Electrical outlet does not supply

Try a different outlet.

 

adequate power.

 

 

 

 

 

Tripped circuit breaker

Reset breaker (power supply) or

 

 

ground fault circuit interrupter.

 

 

 

Unit does not reach high

Diameter of garden hose is too

Replace with a 3/4 inch garden

pressure.

small.

hose.

 

 

 

 

 

Check garden hose for kinks, leaks

 

Water supply is restricted.

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.

 

 

 

 

Spray wand is in low pressure

Turn spray wand to high pressure

 

position.

position.

 

 

 

Output pressure varies high

Not enough inlet water supply.

Turn water on full force. Check

and low.

 

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.

 

 

 

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Karcher K 3.99 M specifications Troubleshooting