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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.
You might want to make sure you have proper air volume in pressure tank.
Shut down system. Drain tank. Fill tank with air via Shrader valve on top of tank until it has a few less psi than the low cut off setting. This will ensure that the tank still has water in it with some pressure still pushing it out when the pump kicks back on.
Without that cushion of air, the pump short cycles. ie every 3 seconds.....
Those pumps will reach 50# when brand new, but soon the parts wear and then they will not make that pressure anymore...
Instead of replaceing the pump, just back the pressure down a tick or two to get it to shut off and not waste your electric....
you say it sounds like air? air passing through a pump that also has a flow of water typically souds like bb's are passing trough the pump...if this is what you are hearing you may have a bad/cracked suction line or collapsed/dried up well..no way to know for sure without actually being there. otherwise adjust pressure switch to a higher shut off. or look for a bad valve. if a valve is not opening all the way it restricts flow hence it uses less water creating a cycling effect.best if you can hook a pressure gauge to the faucet to check pressure.
Check the drain hose and make sure it is not plugged or inked.Check Wire Harness connectors to the Drain Pump, Pressure Switch, and Central Control Unit (CCU)Check/Clean Drain Pump Filter of foreign objectsCheck for Drain Pump FailureCheck the Inlet Valve for proper shut offCheck the Pressure switch for proper operation