Question about Karcher 2500 PSI Pressure Washer

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Pressure washer does not work unless you hold lance trigger and swith off and on

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You didn't say if washer is a/c but sounds as if it is. you have a bad pressure sensor. replace.

Posted on Apr 21, 2009

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Posted on Jan 02, 2017

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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

SPW-2 WONT RUN UNLESS GUN TRIGGER IS HELD ON ?


Check the intake and discharge water lines the filter screens get clogged with calcium etc. Make sure they are clean and clear.

Jan 22, 2015 | Garden

1 Answer

How do i fit a new lance to Challenge MH02-1610GO pressure washer


Just the lance or trigger gun! Best of luck to ya!

Sep 23, 2014 | Garden

1 Answer

Pressure washer stops abruptly after a few minutes of running. It's not like fuel starvation but a sudden complete stop. Happens more when lance trigger is released.


sounds like a faulty unloader valve i would not recommend using it unless problem make sure unloader is not overtightened

Aug 14, 2014 | Garden

1 Answer

Karcher 2500ph pressure washer spill valve has been replaced pull wand trigger pressure good for 3 or 4 seconds drops off for a second or 2 goes back to good pressure for 3 or 4 seconds drops off again for...


If you have a Karcher then you should always post your machines barcode.

full article on nozzles :
http://repairshed.blogspot.com/2013/09/pressure-washer-lance-nozzles-what-you.html

The spill valve operates at approx 20% higher than specified pressure washer operating pressure. If you have any lance issues then the pressure could be running higher than specified (machine running at same pressure as spill valve operation pressure)

your machine produces a fixed flowrate of water (maybe 8 litres per minute) and your nozzle is a fixed size. the diameter of the nozzle determines the back pressure. A piece of debris could further close your nozzle orifice and increase the back pressure. Using a new lance that has the wrong nozzle fitted can also cause this issue.

The karcher barcode is on a silver sticker and is usually 15 digits long. Example 156987400000123 is actually model 1.569-874.0 and serial number 00123....

Aug 15, 2013 | Garden

1 Answer

How to clean out a power washer


This sounds like you need to bleed the system of air. If you take off the lance and then hold the trigger untill you have a steady jet flow and then once this is achieved put the lance back on.

It could also be that something is blocking the nozzle of the lance.

Apr 11, 2012 | Karcher Garden

1 Answer

No pressure unless i take the nosle off , pull trigger and put nossel back on then it's ok until i release the trigger again ?


unloader valve sticking in the pump head. remove unloader valve/ pressure reducing valve as per parts manual.

It will probably be caked up in white crystal type deposits if its an aluminium pump head. clean off the deposits and inspect the 'o' rings. if 'o' rings ok , apply silicon grease and refit.

It could also be a partially blocked lance jet not allowing enough water to come out of the lance if it is a flow sensitive unloader valve.

Jul 11, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

Karcher K2.89


Dear Pajodi,
I just came across your problem. I have just joined FIXYA, and solved various Karcher problems. First of all with all respect, the shop from where you bought the machine, must have told you all necessary instructions to operate your machine.
Now the soap always works on low pressure. So if you have a variable lance, turn it to low pressure. You can also remove the lance, and the soap will surely starts to work. With turbo lances, the soap system does not work. This concludes that the soap does not work when high pressure is used. Bigger machines do spray soap at high and low pressures. But these have regulating knobs, to swith off and on, the soap supply.
Regards,
MG.

Jul 21, 2008 | Karcher 2500 PSI Pressure Washer

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