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But water comes out the end right? just under hose pressure only I bet.
I have one of these units and every time I think it has gone bad I manage to find the problem.
This unit not only has the switch on the front that needs to be on but it also has a safety switch on the plug where it plugs into a wall or extension cord. The last time I thought mine had gone bad it had actually blown the fuse.
the unit was plugged into an outside outlet via extension cord. It just so happens that that is an GFCI outlet. I think the wife got water on the extension cord and that caused it to blow. So check:
The power switch on the front
The safety switch on the cord,
The outlet it is plugged into
Usually, for us, it is the button on the cord when it is plugged into an extension cord it always gets the test button bumped which shuts it down.
I have owned four of those units. Every one of them did what you are experiencing or just wouldn't give me any pressure after only a few uses. The company was certainly no help. I gave up after four and bought a heavier gas model from Lowes. Hope this info helps.
Don't starve the inlet to the pump. It will detroy it.
Buy a pressure regulating valve and plumb it in line per the instructions. Do not use a relief valve because you will have to have a return line or you will heat the water up on the inlet side of the pump depending on how the pressure washer is set up. It should already have a safety relief valve. You might look and also find a pressure regulator that is adjustable and all you problems will be solved.
try running the machine without the hose attached if the machine runs ok then it is probable the there is a blockage in the nozzle if the the machine still cuts out then the pressure switch will probably be stuck or faulty this switch will be inline with the on/off switch and the motor it can be checked using a multi meter after dissconecting the power.