Having problems with your Pressure Washers ?

Karcher 650m no pressure, compressor humming, but no pressure


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Karcher K4 Hello, just cleaning my patio been using it for two days and it has stopped pressuring up, water comes through the lance but there is a humming noise coming from the unit when switched on, weather the trigger is pulled or not. Thanks for your time hope you can help. Regards Gareth


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I have had 3 Karcher pressure washers all experience the same problem and so have two of my neighbors. Our area has very hard water and it causes problems with the washer not bringing up the pressure when the trigger is pulled (or surges up and down) and the nozzles clogging, etc. The service repair facilities cannot tell me how to prevent this. Many attempts to contact Karcher for advice have been ignored. I have been thinking that perhaps running the engine for a few seconds with no hoses a


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