Question about Karcher 2500 PSI Pressure Washer

Open Question

Water pressure inconsistent

Our home is on a private well system where the water is particularly hard. I have had my washer for about 3 years and more often than not, the pressure coming out of the washer is inconsistent. When using the Karcher Rotary Nozzle, the water comes out as a stream when the trigger is pulled. Numerous pulls of the trigger later, something will change or "let go" and the pressure is correct and the nozzle works as long as the trigger is kept depressed. I don't know if there is a calcium buildup somewhere in the machine that is causing the inconsistent pressure or if there is another reason for the low pressure. Using the other nozzles has the same results, low pressure, numerous trigger pulls, finally the correct pressure as long as the trigger is depressed.
Is there a water filter on the machine that can be cleaned or replaced or is something else wrong?
Thank you in advance for any help you can offer.

Posted by on

  • jdb123 Sep 20, 2008

    very similar problem here --- Karcher rotary nozzle just suddenly stuck to a solid stream and haven't been able to unstick it yet


1 Suggested Answer

  • 1 Answer

SOURCE: gas pressure washer

I have the same problem with a Karcher 2400hh.
Go to:
they have the best diagrams and answerss that I have found.

Posted on Jul 06, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Hi, Pressure washer is difficult to start and then the pressure is inconsistent, yo-yo-ing up and down. Idles roughly.

pressure up and down indicates a problem pressure control regulator or blocked jet at the wand end
fix the problem carby as well

Jun 12, 2015 | Pressure Washers

1 Answer

Why has my pressure washer lost its high pressure

you may have worn seals in the pump have them replaced if possible.

Aug 17, 2014 | Pressure Washers

1 Answer

No pressure

sounds like valves inside are stuck more so if any water was left inside the unit

Aug 26, 2012 | Honda Black Max 2600 PSI Pressure Washer

2 Answers


I have same model with same problem. Tried the easy fixes:
unloader valve lube and clean, inlet water sufficient, and nozzles and hose are fine. Broke down pump and called for parts (about $50 for 3 inlet valves and some seals) hopefully this will fix it. Mine has been used in my business pretty hard for a few years, so not bad.

Jun 11, 2011 | Karcher G 2600 VH Gas Pressure Washer

1 Answer

With pump removed engines runs fine. When new pump is installed it is very hard to pull with water flowing but will not start. Engine was just tuned up late year.

Chances are that your new pump is generating good pressure. Because of this, the engine is trying to turn over against the pressurized system. Try pulling the handle on your wand when pull starting the engine to see if this eliminates your problem.

Jul 01, 2010 | Briggs & Stratton Prosumer 20324 Gas...

1 Answer

I have had 3 Karcher pressure washers all experience the same problem and so have two of my neighbors. Our area has very hard water and it causes problems with the washer not bringing up the pressure when...

If your water is that hard (and it appears it is) WD40 will NOT solve the problem. You should look into a water softener. However, chances are that a small, inexpensive model will not have the flow capacity required for a pressure washer. You'll likely need to look at a larger, whole-house model.

Use vinegar to through the machine's "soap" dispenser to break up the hard water deposits or a heavier solvent such as CLR which is available at most retail outlets.

Nov 04, 2009 | Karcher K2.26 Electric Power Washer

2 Answers

Troy-bilt 2200 psi pressure washer

I have a Troybilt Model 2200 PSI Pressure Washer in which I have used only 2 times in the past 2 1/2 years. Went to use it this past weekend and the pump in not working. Water shoots out of the side. I bought this brand and model as I thought Troybilt was suppose to be so good. Went back to where it was purchased and had no success but to say I could buy another pump or take it in to be repaired. I believe that this power washer should be replaced at no charge. 2 uses does not constitute a few hundreds of dollars.
Have you to heard anything concerning pump problems on this particular model? Thanks for any advice. .

Jul 09, 2009 | Pressure Washers

1 Answer

Karcher Power Washer that surges up and down with water pressure.

Before you start it up:
1. Disconnect the high pressure hose 2. Connect the water supply and turn on 3. Make sure water is flowing through the pump
Start the motor, run for about 10 seconds and then turn off.
Turn off the water supply, connect the high pressure hose, turn water back on, start the motor and away you go.

May 29, 2009 | Karcher 2500 PSI Pressure Washer

Not finding what you are looking for?
Karcher 2500 PSI Pressure Washer Logo

Related Topics:

468 people viewed this question

Ask a Question

Usually answered in minutes!

Top Karcher Pressure Washers Experts

John Trevino

Level 3 Expert

1378 Answers

andy just round the...

Level 1 Expert

47 Answers


Level 3 Expert

479 Answers

Are you a Karcher Pressure Washer Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides