Take the wand hose off the washer itself and you will likely find a filter outfit that gets plugged up. Take it out and clean it real good. Mine was full of stuff out of the hose that gets in when the hose lays on the ground and stuff gets in. Also if hose has been used to drain anything. My filter was plugged and with the pressure it created the washer would not shut off. There could be a filter in the wand area in some models.
SOURCE: pressure washer stalls out when wand nozzle is released
common for not starting unless trigger engaged as you are turning the pump as well as engine creating pressure,as for stalling pump has unloader valve which is probably in need of grease(use good silicone grease)this allows water to ciculate when trigger released.
SOURCE: no high pressure no leaks motor runs off and on when trigger is released
check filter in wand and clean out nozzle hole for starters
SOURCE: Karcher K 3.68M Electric Pressure Washer. Wand trigger Locks Up.
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
SOURCE: Turn water on then actuate wand trigger. Pressure
You gave a very close solution yourself for the problem. But other leakages can cause such symtoms.Forexample a leaking head or a leaking chemical inlet. These can be caused because the spill valve (pressure control valve) is stuck. When this valve stucks it will leave a micro switch ON. So the machine keeps working with the gun closed. This will in turn creat internal pressure and damages the head, valves and chemical non-return and even damage outlet hose. So besides fixing the leakages you must check and service the spill valve. I often replace the spill valve. One must also checks if the micro switch is faulty. Now very important that what you mentioned that the machine cycles at one minute intervals, with trigger closed...this is most probably always the spill valve fault. If you open machine you see a place where there is a wire..this belongs to the micro switch...under you find the spill valve. Intake and suction valves may now also have a fault. Also there are systems with non-return valves at the machine outlet. You have to tackle by elimination. Fix the leakage..then tackle spill valve and micro switch.
Fulltech.
SOURCE: My electric Karcher pressure washer does not shut off.
this can be that you need to bleed the system of air or that there is a problem with your trigger gun sticking when you release the trigger.
These are two things I would check before you go into the machine.
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