Question about Karcher 2500 PSI Pressure Washer

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Karcher k3.86 motor runs but has no pressure when trigger pulled, motor doesn't go faster.

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Could be a pump, but most likely the unloader valve is stuck open. After replacing/repairing the valve, do the following to prevent it in the future: after finishing using it, unhook both hoses and pull the start cord on the engine several times to empty the water from the pump and valves. This is especially necessary when using hard water.

Posted on Nov 20, 2009

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Related Questions:

1 Answer

Where is the inlet regulator on my karcher 3300 high pressure washer


no inlet pressure regulator as they work of mains pressure
the only pressure regulator ther eis works off the wand trigger
when the trigger is pulled the pressure in the line drops off and the regulator switches on the motor to produce high pressure
when the trigger is let off the regulator reads the pressure and shuts off the pump;or allows the pressure to by pass back to the inlet side of the pump

Oct 30, 2016 | Karcher Garden

1 Answer

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

What is this problem - Karcher 3.86 electric pressure washer: humming noise, plug gets very hot, then unit shuts down?


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.

May 20, 2014 | Karcher Garden

1 Answer

My karcher k7.85 has lost pressure and the motor runs constantly when switched on ,motor only used to run when trigger pulled in on lance ,there is no leaks. Can any one help please.


Sounds like the pump seals are bad. The manual says to only use these a few minutes at a time, most people try to clean the patio etc with them, run them too long, and burn out the pump seals - don't ask me how I know this.

Feb 17, 2014 | Karcher Garden

1 Answer

Karcher pressure washer 620m motor only runs with switch held down but will not water pressur is the same as tap pressure out the nozzle


it is not uncommon that the switch is bad? if the switch controls the pressure telling it their is water and to start working? then i would just replace the switch.

Dec 17, 2013 | Karcher Garden

1 Answer

I own a Karcher 3000 pressure washer. There is no water pressure. I've checked the obvious...hose to house, kinks, attachment is tight....Enging runs, no water pressure.


I had the same problem. On the top of the pump there is a little nickle colored button cap. It is attached on both sides with a screw. What this actually does I don't know but when I took it off with the motor running and put my finger over it the pressure come up. I also discovered that having the motor running and taking the nozzle tip off and pulling the trigger would clear the pump to work until you let of the trigger again. Weird but it works for me.

Aug 06, 2010 | Karcher Garden

1 Answer

Motor running, water supply adequate but when


clean whole water supply and outlet from all debris, clean inlet filter as well. connect water and pressurise washer, pull trigger and wait about 3sec for pump to activate, if pump do not activate adn you have pressure from nozzle as it will be from main, this determines pressure sensor (it is extremelly rare for pump itself) is damaged.

check if you have still warranty,this will qualify as warranty repair, if warranty is expired, pressure sensor need to be replaced.

if you find my advice useful, please do not hesitate to leave your remarks and vote for me, thanx!

Jul 31, 2010 | Karcher 1750 Psi Elec Pressure Washer

1 Answer

Karcher pressure washer hunts ~ off/on ~ when running. How do I fix?


HI Your machine wil start and stop if you have any external leaks when the machine is running at not pressing the trigger. Please start the machine and not pull the trigger and look form leaks. A common one is around the high pressure hose outlet and also the trigger.

Jun 11, 2010 | Karcher 1750 psi Electric Pressure Washer

1 Answer

Karcher K3.91 compressor run for a few seconds every 10-15 second


They have a problem. I removed both valves and lubed with lithium grease as I was told. Unit is now working for how long who knowes.

May 18, 2009 | Karcher PSI Electric Pressure Washer

1 Answer

Kracher k3 97, low pressure


your pressure relief valve is stuck open. try adjusting the nut shaped stem on the front of the valve to see if you can unstick it. if not you'll have to take apart and clean.

Jul 13, 2008 | Karcher 2500 PSI Pressure Washer

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