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Karcher 3.99 electic pressure washer. Compressor/pump run but do not build up high pressure.

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I have had a problem similar in the past , mine is gas powered and all it was was the o-rings were worn out and was by-pasting on the wond. It could be also the electic control switch is fault on that model. Hope this helps.

Posted on Jul 26, 2009

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Check filter and manually adjust pressure by screwing down---clockwise thebrassnut on the outlet side

Posted on Jul 26, 2009

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1 Answer

Karcher K2.94 intermittent pumping and buzzing


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buzzing is usually the noise made by the motor when it cant turn. if the pump start to pruduce pressure but the pressure builds up too high then the motor will stop turning... faulty lance or faulty spill valve (dump valve)

If you have a Karcher then you should always post your machines barcode.
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