Jura Printed c90 Bj2012

Hello all.
At my Jura the descaling program starts only half.
It comes the message medium in tank and then it goes no further. I can press what I want but nothing happens.

Thanks for your help

You have to press the maintenance button.
If you press the maintenance button in normal operation, does the machine rinse?

Unfortunately, it does not respond to the flush button.
In normal operation I can flush it
.

You have removed the trester bowl once?
You also have to remove the water tank and put it back on.
Since you can start the descaling, it can not be due to an activated filter. Therefore, almost only the above remains.

I'm afraid not. Filter I have deactivated.
Tresterschale and water tank I have already zick times taken out also times longer left outside. Unfortunately without success.