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Hi, I have a Karcher 730 pressure washer and it just suddenly stopped working. I have checked the fuses etc can you give me any idea's please. Rick

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  • Brian Manuel Mar 27, 2011

    When you say just stopped working do you mean wouldn't start? Does it mean it starts but the water won't pump out or???

  • syl1951 Mar 27, 2011

    It wont start, water comes out of gun but no motor or pressure sounds

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The problem could be a pressure sensor that is operated by the water pressure connected to the inlet. This sensor switches the motor on only when there is sufficient water pressure on the inlet, and switches the motor off when there is insufficient pressure.

You will need to take the casing off the machine and find the sensor. It should be readily apparent as a switch attached to the incoming water supply which is operated by a small plunger. This can become corroded and stick, and will need to be removed and cleaned before the machine will operate again. If you are able to undertake this type of repair I suggest you lubricate the plunger with silicone grease when you re-assemble it.

I can't guarantee this is the problem but in my own experience it is worthwhile invetigating.

Posted on Mar 27, 2011

  • syl1951 Mar 27, 2011

    Thanks I will give this a try

  • Sport101 Mar 27, 2011

    Not sure if this an electric model but I found a bad GFCI plug on a Karcher pressure washer that belongs to a friend of mine. The symptom was that the plug could not be reset. Since he was plugging into a GFCI protected outlet in his garage anyway, I simply replaced the GFCI plug with a standard plug.

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