Is a milk frother that does not work. It is that simple. In over 6 years of working with the Jura Coffee machines, this is almost always the case. And when it is not the case then normally the breathing valve is forced in to far or damaged, since it has been played with.
This is the way they tell you do do it in the manual.
We do not recommend this but if it needs to be done then this is how to to it.