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Karcher 4040 power washer , its hot what i would say is hick ups when trigger is releasedit switches on and off about one second pulses

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Mine had the same problem and needed a new Control Head Spare Parts Set which you got to strip down to replace good hours work once you have the parts

Posted on May 18, 2009

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6ya6ya
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Posted on Jan 02, 2017

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How do i stop it from pulsing?


Getting to much air to carb probably.

Jul 11, 2015 | 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 pressure did turn on but stopped working altogether now wont turn on


Make sure that your circuit breaker did not go off and you have power..

Turn on the water after connecting the hoses. Then connect an ohm meter to the hot and ground legs of the male power plug. Push the on/off button to on and then pull the trigger. When you do that your ohm meter should indicate the resistance of the motor windings. If the resistance still stays at zero, then 1 - your motor is burnt out, 2 - the on/off switch is not working, 3 - the water pressure switch is electrically open. Check all three for proper operation and replace as needed.

Apr 01, 2014 | Karcher Garden

1 Answer

Karcher KB4040 pulsing when trigger closed and has lost about 50% of its power


Just google " stripping down Karcher KB4040" A YOU TUBE CLIP will show you hiw to fix it and what tools you need

Jun 05, 2012 | Garden

1 Answer

I have a Karcher K3.540 pressure washer. Won't take up detergent and motor pulses ever second if vari-lance increased towards maximim. Motor runs ok at lower pressure but can take 1min to start wh


This fault is within the control head, under the detergent valve is a small spring loaded valve that acts to induce the detergent, this will have failed, the shaft of the component breaks off the disk base leaving a small hole in the centre of the disk. This is enough to allow pressure past the component. The machine will pulse when operated and will not induce the detergent. I've looked everywhere to find this part as I have a karcher with the same fault.

Jan 22, 2012 | Karcher Garden

1 Answer

After sitting for several weeks, I plugged my electric 1500 PSI unit and nothing happened. Usually there is a pulse in the motor and it waits for the trigger to flow water to reinitialize the pump. ...


this Karcher unit have a termal overload in the motor but your problem can be cause by a pressure switch the shutt on and off the motor when you stop spraying.

Aug 15, 2010 | Karcher K2.26 Electric Power Washer

2 Answers

POWER CRAFT BY Karcher bought Aldi on 31Mar 05.2100Watts 130 bar.


You did winterize the machine? Leaving water in a powerwasher will freeze and damage the pump. It's a common happening, because people don't think of it or are not told by the maker.

Apr 29, 2010 | Karcher K2.26 Electric Power Washer

1 Answer

Karcher K4.97M electric waterblaster cycling


It sounds to me like the unloader valve is bypassing internally.

Nov 16, 2009 | Karcher K2.26 Electric Power Washer

2 Answers

The motor is pulsing on and off without the trigger being pressed


It is probably sucking air on one of the connections or around one of the fittings at the regulator. You can also turn the pressure up allittle on the regulator, that might stop it also. Make sure the clamps on the hoses going to the regulator is tite. Also it could be that the regulator is just bypassing water and if it has air in it it will pulsate.

Mar 14, 2009 | Karcher K2.26 Electric Power Washer

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