Karcher K 3.99M manual Troubleshooting, Symptom Cause Solution

Troubleshooting

￿CAUTION

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”	Turn switch to the “ON” (I)
	(O) position.	position
	Power cord is not plugged in.	Plug in power cord.
	Electrical outlet does not	Try a different outlet.
	supply adequate power.
	Tripped circuit breaker.	Switch off pressure washer.
		GFCI will reset once the tem-
		perature of the unit drops.
Unit does not reach	Diameter of garden hose is	Replace with a 5/8 inch or
high pressure.	too small.	larger garden hose.
	Water supply is restricted.	Check garden hose for
		kinks, leaks and blockage.
	Not enough inlet water supp-	Open water source full force.
	ly.
	Water inlet filter is clogged.	Remove filter and rinse out
		in warm water.
	Spray wand is on low pres-	Turn spray wand to high
	sure position.	pressure position.
Output pressure va-	Not enough inlet water supp-	Turn water on full force.
ries high and low.	ly.	Check garden hose for
		kinks, leaks or blockage.
	Pump is sucking air.	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.
	Water inlet filter is clogged.	Remove filter and rinse out
		in warm water.
	Discharge nozzle is obstruc-	Blow out or remove debris
	ted.	with a fine needle.
	Calcified gun, hose or spray	Run distilled vinegar through
	wand.	detergent suction tube.

English 15