Question about Alfred Karcher K 5.93 M Electric Pressure Washer

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Low pressure motor switches on and off continuously with trigger released

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If there is no water leak, then yiou may have a crack in the machines outlet head, the crack is inbetween the bypass chamber and the machines safty valve

Posted on Jun 18, 2009

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Posted on Jan 02, 2017

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My Karcher 530M runs ok until I release the trigger, then it will not start again unless I switch and allow the water to run through for about 15 secs before switching on again


Hi Cliff:
My experience is that the pump pressures prevent the engine from starting, so we hold the trigger while starting.
My brother has cut a wedge of wood that he uses to jam the trigger open to bypass the problem. It can get a bit wild if the wand is not secured when the unit is started..

Aug 10, 2016 | Karcher Garden

1 Answer

Pressure washer will not shut off when water trigger on wand is released


Sharon, you first should make sure you have no connection/leaks any where. There is a pressure switch inside the pump, which controls when the motor turns on and off. Leaks in pressure causes the pressure switch to activate the motor. Leaks are the biggest contributor to a cycling machine. If no leaks, the pressure switch is defective. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Karcher North America Home Garden Online Help
Frequently Asked Questions about Pressure Washers
Common Pressure Washer Repair Problems Pressure Cleaned

May 18, 2016 | Garden

1 Answer

I switch the pressure washer on motor starts pressure builds up motor stops. OK pull the trigger on the lance the moter starts sounds different water pressure low. Release trigger motor still runs.


It isnt very clear your explanation of the problem but what type washer do you have first? It sounds like you have a bad unloader or need a new variable nozzle tip. Can you explain in more clear detail. Thanks

Feb 16, 2015 | Garden

1 Answer

How to set a high pressure unloader valve on a FAIP 1500 H120 washer


Are you talking about the electric switch that shuts off the motor when the trigger is released?
If so, there is an arm that comes out of the high pressure side of the manifold and is connected to a spring loaded piston. The piston extends under high pressure (spray trigger released) and retracts when spraying. At the opposite end of the arm is an allen screw and locknut. The allen screw bears on the microswitch arm to control the electric motor. When properly adjusted, the motor should turn off when the trigger is released. If it doesn't, loosen the locknut and adjust the allen screw slightly outwards toward the switch. Pull the trigger a few times and verify the motor starts up and shuts down when you release it. Tighten locknut.
Hope that helps.

Jul 11, 2014 | FAIP 1500 PSI Electric Power Washer

2 Answers

I can't get the pressure washer to start up. The water is coming out of the hose, but there is no water pressure


If the washer is the kind that shuts off completely when the pistol grip is released, the problem is likely the little pressure sensor located near the output fitting (the threaded part to which the hose connects). The sensor is a little plunger held down against an opening in the side of the pipe by a spring when there is low or no pressure in the output pipe, as when the trigger is pulled and the pressurized water in the hose is released by pulling the trigger. That completes the electrical circuit and the washer is on and continues pumping water. When the trigger is released, water in the hose and output pipe jams up super high pressure, forcing tjhe little plunger out against the spring, and the electrical circuit is broken. If you take the case apart, you will see wires coming from that area. The fix (if this is the problem) is to free up the little plunger.

Dec 05, 2012 | Coleman Powermate DuraBuilt 1400 PSI...

1 Answer

Pressure washer starts fine and sprays fine but will not continue to idle after nozzle trigger is let go. Have to have trigger pulled to start & cannot let go without unit stopping.


The pressure unloader us usually the first part/s that fail. An unloader can fail resulting in no or very low pressure or good pressure, however will not unload when trigger is released and stall the motor. Look at breakdown for your pump and determine if unloader parts are available and reasonable. If too costly to replace these parts then install an ez start valve to help start engine and tie back wand handle to deal with unloader problem (workaround). Ez start valve can be seen here:
http://www.cmcpwe.com/accessorystartvalve.html

When not in use, store washer with oil in pump to displace the water. The oil will help lube internal parts and possibly cause the unloader to begin working (if stuck due to debris/rust). You can find a gizmo to help you feed oil into pump on ebay /other web locations. Good luck with your repair.

Apr 27, 2011 | Dewalt DPD3100 Gas Pressure Washer

1 Answer

Turn water on then actuate wand trigger. Pressure washer leaks when wand trigger is actuated and has very low pressure/flow output. After releasing trigger the pressure cycles on - off at approx 1 second...


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.

Jul 03, 2010 | Karcher PSI Electric Pressure Washer

1 Answer

Stalls when triger released


the problem may be the oil. if the oil is fine then try crimping your hose to let less water pressure through. if that still does not work lowes or home depot will fix the problem cheap. thank you for using fixya

May 01, 2009 | Garden

3 Answers

Powermate pressure washer Model PW0872400


pressure washers has this pressure switches where in as you press on the trigger, the washer works and if you release it, the pressure would build up high and it would trip this switch to turn off the motor or deflect the water to the by pass hose ( if the motor is not stopping) then as you press again the trigger, water should come out of the gun again but would not,

i have encountered the problem is in the pressure switch, even the pressure went down, sometimes it wont close the contact then the motor wont run ,

if the motor is continously running, then the trigger switch is the problem, the pressure excerted on the switch is so high that even if you press it , it won't open up to release the water.

what i can suggest is to tie the trigger in the gun so that it is always pressed and then just unplug the unit if you want to stop using it. it is an inconvenience but it will work.

or, open the gun and see if you can figure out why pressing the trigger would not open the switch.

another option is you can lower the pressure of the washer if it has an adjustable pessure controller. by lowering the pressure might open the switch when ever you press the trigger.

i hopw i was able to fix...

good luck,

drcool

Aug 21, 2008 | Coleman (100076) Compact Refrigerator

1 Answer

Karcher K3.92 M 1750 PSI poweer Washer motor won't start. Followed Reset/Test/Reset sequence with cord plugged directly into outlet. Light on cord near Reset comes on when Reset pressed down but goes off...


They are sensitive to large extention cords. My father in laws pops reset when a small cord is used. If internally shorted- motor will continually pop the reset even plugged direct to outlet. Check voltage at outlet.

Jun 19, 2008 | Karcher 2500 PSI Pressure Washer

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