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Karcher Pressure washer surging/pulsing

I have Karcher model K3.86M electric pressure washer. The unit pulses on and off without depressing the trigger on the wand. Other solutions here state that the problem is with a faulty Control Valve / Spill valve. I have taken the machine apart in an attempt to solve the problem myself. Can someone, such as Fulltech, explain where I find this spill valve as I would like to try to examine and lube this piece before I have to buy a new one. If I know what it looks like or where on the machine it is, I can service it.

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Posted on May 31, 2009

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Posted on Jan 02, 2017

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What is this problem - Karcher 3.86 electric pressure washer: humming noise, plug gets very hot, then unit shuts down?


Your pressure washer is either not fitted with a run/stop device in which case like mine you have to switch off within a few seconds of closing the trigger. Check your model features?
The humming noise is the motor stalled out against the pump because there is nowhere for the water to go. The shutoff is caused by the safety overload switching off after overheat.
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My electric Karcher pressure washer does not shut off.


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May 14, 2012 | Karcher Garden

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Turn on machine starts then cuts off


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regards
brad

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1 Answer

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The wands that it will not run with would most likley have a little dirt in the tip of the nozzle. This would not allow the water to flow through in turn activating the pressure switch and shutting the machine down

Troy

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