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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.
Or, it has a pressure operated run/stop which is not working. Because water and electricity don't mix, I would suggest getting more specific help. You can download Karcher manuals /spares lists online from Karcher specialists but remember electricity is the silent killer.
This sounds like it could be a problem with the handle. The part number for the replacement handle is 2.641-202.0 when you call your local kacher supplier/dealer to replace it just ask them to make sure that the part number I gave you will fit onto your high presure hose as the fiitings can change from older and newer models.
HI Your machine wil start and stop if you have any external leaks when the machine is running at not pressing the trigger. Please start the machine and not pull the trigger and look form leaks. A common one is around the high pressure hose outlet and also the trigger.
You most likely have split the head of the pressure pump. This happens if you use the trigger to stop and start the water flow. My advice is to put a zippy tie around the trigger holding it on all the time and start and stop the machine by the knob on the body.
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
Sounds like the pressure valve is broken thats why you cant depress the trigger , the valve is on the pump , i would suggest taking it to a repair shop as they are fiddly things to fix
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