Where can I get a Karcher 410 spray nozzle (bit on end of wand) Karcher don't seem to keep such an old part.

I had the same problem. I removed the spray part of the spray gun so I was on soap setting and I had water but when I reconnected the spray wand same thing.
* I turned out to be a little bit of grit was in the nozzle. I cleaned out the grit and my spray cleaner worked without a problem.

blocked pressure hose or blocked nozzle at the end of the wand
it is controlled by a pressure relief regulator which quite often plays up.

My XP5240 also started blowing the steamer wand off after about 3 months of use, despite fiollowing the Krups cleaning instructions. Here's what I did to fix it.

A: The Problems.
The wand has three holes in the coffee end (center, and on each side). The center hole gets blocked with milk residue. This causes a pressure build up in the wand assembly, and eventually this is enough pressure to overcome the three gripping clips that hold the wand to the nozzle tube. I suspect this was an intentional design for safety. It's unfortunate that it also sprays the user with milk when it lets go.

The second problem is that removing the wand requires that the outer clip retainer ring to be slid down to release the clips. Many users don't realize this and try to pry or twist the wand off. This breaks the clips.

B: The Solution
The wand has to be regularly and throughly cleaned. Just soaking it is not enough. Do it this way:

1. Slide the clip retainer ring down, and then hold the steam tube and gently move the wand straight down. DO NOT try to twist the wand to one side, or you WILL break the clips.

2. Holding the ring, unscrew the coffee nozzle end. The wand separates into three parts: Outer tube, inner steam tube and decorative cylinder.

3. Use a needle or very fine wire (approx 0.4mm) to clear the three holes in the coffee end nozzle.

4. You now need to clear the metal wand tube of milk residue. I found that a 7/64" drill bit was perfect to do this, as it fits snugly in the tube. The amount of gunk removed was surprising.

5. Blow the tube clear from both ends. If it's clean, you will be able to see light through all three holes. If not, go back to step #3.

6. Make sure that there is no milk residue on the steamer tube nozzle where the wand clips on. Milk contains fat, and this is an unwanted lubricant.

After cleaning, my steamer works properly for several days. I also located a 21mm ID O-ring at the local hardware store to hook over the clips. This provides a bit more clip gripping pressure, but will still allow the wand to come off should steam pressure gets excessive.

hi,
there is a small ball bearing inside the nozzle on the end of the lance , this can get jammed or missaligned and the nozzle orifice can get blocked , clean this or replace the whole lance with another 200 Bar lance .

hope this helps

Its probaly between the nozzle and wand, grab nozzle and hold it still and slightly move wand to see if it shorts

It sems you have a blockage in the tip. If you get a grain of sand in the nozzle it will act like this. Get a piece of fine wire and poke down the nozzle to free it up.

i order a new part
thank you for your help.

On the Kärcher, you have a bayonet mount at the base of the tip end of the pistol grip. This is where you attach different types of nozzles and gadgets after having removed the existing sprayer tube. Just push in and turn a quarter of a turn, then you pull it off the pistol grip. The hose is possible to remove from the machine as well, an ordinary threaded mount but since you need the pistol grip to regulate on/off this is probably not what you want to do. If the telescopic wand is made by Kärcher it should be very easy to snap it into place just like when you removed the sprayer tube/nozzle. If the attachment was made to fit Alto washers there is an inexpensive adapter that works very well. Good luck!

sounds like nozzle is blocked.small bits of grit jam nozzle unscrew and make sure its clear turn water on and pull trigger to see if gun trigger works,then refit nozzle check again for spray.if clear start up and try out.if no go then pump probably needs cleaning and relubing seals.

Fairly simple to opperate. Connect water supply hose. Connect wand hose. Plug in, turn on water supply and turn on. Then squeeze the wand handle to spray. With mine, there are times when the unit looses pressure, but if you leave it running, it seems to recover. Also note that you can turn the flare at the end of the wand for a soft stream versus pressure spray. I have had mixed results with the pull out clear tube that is supposed to siphon liquid soap into the mix.