Karcher hds 501c motor wont turn

Question edited for clarity.

Use a DVOM to test the switch and the motor. The capacitor may have failed. Does it hum when you turn it on, that is a good indicator of a failed start/run capacitor.

https://www.ransomspares.co.uk/parts/brands/karcher/pressure-washer-spares/k6.85m-wb%20gb%20%281.397-502.0%29/

Help and videos

https://www.google.com/search?q=karcher+k6.85+doesn%27t+switch+on

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Question edited for clarity. 'Karcher not 'Kracher', add (what it is).
Question moved from Washing Machines category.

It sounds like the contactor has failed internally. This often happens that the internal contacts arc and burn away. The click is the electromagnet still working. Take it off and test it, or leave it on and test the output for continuity once energized.

It is not a known issue.
https://www.sparepartsdirect.com/acatalog/Karcher_HDS_745_m_eco.html

https://www.google.com/search?q=karcher+hds+745m+faulty+contactor

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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.

see if you can spin the cooling fan of motor if so you may have a bad capacitor on motor

Normally when you dry run a machine you damage the pump so it would probably need changing. The motor might be Ok but for you to fix it you will need to take it to a Karcher dealer/service center.

From experiance it sometimes can be more cost efficient to purchase a new Karcher machine and get the 12 month warranty than spending money on an older machine.

Operating manuals

You are going to have to replace the motor, unless you can repair it. That humming noise is the motor trying to start. For some reason, it cant turn. May be the switch (in the motor), something may be jammed in the belt, the bearings may be bad. Open it up and see what it is...Lee

turn the motor to see if it moves it sound like the motor

Dear dumbelldaveb,
Having a 13A fuse I am concluding that the machine is single phase. Most probably you have a faulty capacitor. Check the capacitor and if you find it expanded and leaking...then you must change it with a new one. If you see the capacitor is normal just the same it could be shorted. So change the capacitor with a new one and try to start the machine WITHOUT LOAD. Which means no water inlet and no gun attached. Doing this you can also remove temporarly the micro switches. If the motor still hums, then most probably there is a fault in the electric motor.
Now if you find out that the fault is the capacitor (which in my opinion it is the case)...you must see why the capacitor broke. If when using the machine and the gun is closed, the machine starts on and off on its own,...this will damage the capacitor. This on and off fault could come from a leaking gun. Or a leak from the seals. Whatever....the machine must not be left going ON and Off when the gun is closed. This ON and OFF could be due to faulty micro switches and control valves.
I am very sorry to mention a lot of things, but I hope as in many cases,..the changing of the capacitor will solve the problem. I wish to add that the electrical lead wire must be checked. On many occasions I found that the electrical lead wire from the plug to the machine was damaged and shorted, ..due to pulling, wear and tear.
Regards,
Fulltech.

you have an electrical short in the motor windings. you'll have to either replace the motor or buy another washer. also check to see if the motor isn't locked up with a piece of trash. to do that you'll have to dissassemble housing until you get to the motor. it should turn easily by hand. if so you have a short.