Jura ENA Micro 9 piston no longer lowers

Hello community, I turn to you because I no longer know what to do and hope you can help me.

Since the machine is already from 2014 I wanted to replace the brew group with a refurbished brew group. No sooner said than done. Have the brew group already revised several times insofar I know the processes actually quite well.

Now I have inserted the new brew group and wanted to start. The piston still goes to the top and then there is a terrible noise. The piston also no longer goes down.

Have then reinstalled the old group and there is exactly the same error.

Now we sit here coffee-wise on the dry.

I hope someone knows advice. If a video helps, I can also upload one.

Thanks in advance for your help

Hello, before you install the brewing unit in a Jura, you should check manually whether the brewing unit also moves to all positions. To do this, turn the white gear.
If the brewing piston is out of the brewing cylinder, the brewing unit has been incorrectly assembled.
There is certainly also the case of "returns", where the pawls are worn.

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Ich schaue hier nur noch ganz selten vorbei.
In verschiedenen anderen Foren bin ich mit
dem gleichen Nickname zu finden, falls mal
jemand Hilfe benötigt kann ich vielleicht dort
helfen.

Yes, this could well be off, gear from the motor to rack defective.
Either age weak and or brewing unit too stiff.

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Alles ist Wiederverwertbar, sogar diese Buchstaben.
Keine Anfragen oder Hilfe, über E-Mail.

Hi just check the guide assembled quiet v2
Maybe its already damage
Try to reverse the long gear????