Karcher K2.26M water leak

It sounds like there may be a potential issue with the pressure build-up mechanism in your Karcher K2 compact. The constant motor running without water pressure could indicate a problem with the pump or the pressure switch. I would recommend checking the following:

1. Check the inlet filter: Ensure that the inlet filter is clean and free from any debris or blockages. A clogged filter can restrict water flow and affect pressure.

2. Inspect the nozzle: Make sure the nozzle is not obstructed or damaged. A blocked or damaged nozzle can restrict water flow and affect pressure as well.

3. Check the pressure switch: The pressure switch is responsible for regulating the motor and water flow. It's possible that the switch is faulty or not functioning correctly. Consider contacting Karcher customer support or a professional technician for assistance with checking and possibly replacing the pressure switch.

4. Examine the pump: There might be an issue with the pump itself. It could be worn out, clogged, or experiencing other internal problems. In such cases, it's best to reach out to Karcher customer support or a professional technician for further diagnosis and repair.

Remember to always follow safety precautions and consult the user manual provided by Karcher for specific troubleshooting steps and guidelines.

Take it out of case
Connect to hose. Turn on tap & see were the leek is.

The "manifold" as talked about above is also called the "Control head".
For a picture of the very small cracks in the control head see here: Karcher Control Head cracks

The video linked to below talks about the cracks in the control head at 7:00 through to 7:08. They guy incorrectly calls it the cylinder head in the video. How to FIX Karcher pressure washer

If Karcher made the control head from an aluminium casting, or used a metal insert near the point of failure, their product range would be a LOT more reliable.

You tube, karcher k2 900 take apart, This is the easiest way to do it,

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

Because you have the low pressure and pulse this will be the valve block. Your machine has 3 piston and each has 2 valves (inlet and outlet). Because you dont have the barcode, i cant be sure if you will buy a valve kit of 6 valves or a pre-assembled manifold block.

it could be this machine and spares :
http://www.sparesgiant.com/cleaning-equipment/pressure-washers/karcher/k-series-parts/k2-range/k2-36m16724300/

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....

I have the same Problem, the leak is from the seam of the Manifold housing. There is a small crack in the seam. A manufacturing defect.. A New Manifold Complete Replacement is about $61.03, about the half the price what I paid for this pressure washer at Walmart... :( If under 1 year old, and you can find a receipt to prove it,Karcher will replace the whole Pressure washer under warranty.

Plastic Pump Manifold is cracked.
Can be replace at a local Karcher Service Center, or if you are mechanically handy. Replacement Manifold Complete, is available from www.karcher.com.
If it is under 1 year old, and under warranty Karcher will replace if you have a Receipt proof of purchase.

Is there a water leak from the bottom ?
Is so, then there maybe a small crack in the seam of the plastic manifold pump housing or one of the connecting fittings. A New Manifold Complete about $61.00. You may purchase direct from Karcher, and replace if you are mechanically inclined.
If under 1 year old, and you can find a receipt, Karcher will replace the whole Pressure washer under warranty.

Is there a leak from the bottom ?
If so Problem, the leak is from the seam of the Manifold housing. There is a small crack in the seam. A design weakness.. A New Manifold Complete Replacement approx. $61.03.
If not you may replace the Pump Manifold Housing from Karcher, or locate a local Karcher Service Center.
If under 1 year old, and you can find a receipt,Karcher will replace the entire Pressure Washer under warranty.

Is there a water leaking from the bottom ? If so then there maybe is a small crack in the Pump Plastic Manifold Housing. A New Manifold Complete Replacement is approx. $61.03 from Karcher, if you are mechanically inclined.
If under 1 year old, and you can find a receipt,Karcher will replace the whole Pressure washer under warranty.