Hello everybody,
this is just to keep you posted: after cleaning and reassembling the pump, it seems to be working normally
Thank you all for your help and the info I found on the site!

A small update: I have the impression that the circular piece in black color is some kind of pressure operated switch. It is mounted in the white part. I think when the pump sucks in water, some of it goes to the check valve and goes into the white part ...

alalala ... I really made a mistake: the pump costs 3-4 times the price of the Karcher!
I will try to do the cleaning and possibly the test this WE.
Not much hope though

: shock:: idea:: shock: Actually, what I don't understand is the state of my pump in the electronic part: if we compare with the video in the above message, we see that: - there was about 10 cl of a brown liquid with a special smell (it was not water). -on the engine, we ...

Thank you for the quick feedback Ahmed.
Indeed, I do not have a buffer tank: the pump was connected directly to the Karcher ...

Hello, I have a problem with my Divertron 1200X pump: it regularly trips when it is turned on. Sometimes it happens that it works a little. I have the impression that the problem happened when I connected the output of the pump to my karcher ... When disassembling the pump, I found a mar liquid ...