Impressa S9 - problems after new o-rings

Hi!

My german is not very good so please forgive me for posting in english (I hope you understand).

My Impressa S9 has brewed approx. 8500 cups and finally I couldn't get around malfunction 8 so I decided to fix my brewing unit. I disassembled the unit (lot's of work :-) ) and put new o-rings on every piece that I found (2 big ones, 2 small ones & 2 very small ones). After reassembling and putting it back into the machine everything seemed fine when powering up the machine. The mechanical sound from the brewing unit was "fantastic" (like new) so new o-rings and silicone is magic I must say. I rinsed the unit and then brewed 1 cup of coffee (which I didn't drink - just for test) and then I thought, yes, it's working again, yipee! I then thought, even though the clock is 4 in the morning and I'm dead tired after this much work with the machine I must do the cleaning program and then make a cup before going to bed (yes, I can sleep after drinking coffee :-) ). Well, I started the cleaning program and immediately I thought something was wrong because the water in the beginning of the program always comes out from the coffee spout but there was no water coming out there and not through the whole programme. After the cleaning program was finished I rinsed the unit again and no water still. Everything comes out on the drip tray (from the cleaning program and rinse program).

So, anybody has a good idea of what I must have done wrong when reassembling the unit? Again, water came out from the first rinse and from the first coffee but after that - no coffee. Also, before the final malfunction 8 I had and before taking the unit apart I had no problems with the water, that was always working, it was that the brewing unit got stuck that was the problem, so again, the problem I now had is because I took the brewing unit apart.

I've also opened the front door again to check if the hose to the back of the spout wasn't connected but it's sitting there firmly with it's clip so that isn't the problem at least.

TIA!

Hello,

it seems that the "Drainageventil"(drain valve) is always open.
Did you revise this part also?
Look especially for the white little plastic part that sits onto the "Ventilstift"(valve pin). It must tightly hold onto the metal pin, otherways it could cause your current problem.

See here:
http://www.juraprofi.de/anleitungen/BNDDrvl.pdf
More Manuals of this kind you will find here:
http://www.juraprofi.de/Service-Anleitungen:_:70.html

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Quick Mill 05000 "Unique Edition", WMF Ecco

Hi!

Thank you for your answer. Well I've been busy with the machine for some hours now and still I have the problem. I fixed another problem that I hadn't bothered with namely the steam not working so that's ok now!

Anyhow I've disassembled the brewing unit totally I think including the valve you mention. And I can't see anything wrong with it and the parts. I reassembled and still it's the same. Now I've shot a small video to illustrate how the water comes inside and hopefully that can shed some more light for you experts out there. First I rinse the unit and after that I "brew" a cup without any beans.

Jura Impressa S9 after brewing unit was renovated...

Okay, the Video makes clear that the water comes from the upper side of the brew chamber.
Therefore the drain valve is okay, but the upper sealing doesn't make her job.

Or did you do the pipe wrong that goes to the spout?
Is it fitted right in the hole inside the upper piston?

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Quick Mill 05000 "Unique Edition", WMF Ecco

Yes!!! It works now!

The thing was that when I bought the big brewing unit renovation kit some years ago I didn't receive more than a paper with textual instructions in german and therefore I disassembled and reassembled the brewing unit on my own and apparently, although working mechanically something was wrong since the water came flowing from the upper part of the brewing unit. Today I disassembled and reassembled and following the instructions document by kaffemaschinendoktor.de and not only didn't that illustrate that the big o-rings had to be in a specific direction but also that as illustrated by the arrow on picture 39 in the instructions - the plastic part must match properly (but it is possible to mount the plastics "mirrored", then the mechanics of the brewing unit will still work and sound rightt but probably that was the major fault factor in my case).

So, W1cht3lm@nn, thanks a lot for taking the time to answer me and for pointing me in the direction that it couldn't be my drain valve (which I took apart 3-4 times to inspect for errors that wasn't there) according to the video I uploaded.

Me and my wife celebrated with a big latte each made with the profi cappucino unit (since I also totally renovated the steaming circuit/function yesterday (of course, after I cleaned the machine first with a tablet)).

Hello, i'm glad to read about your success.

I can't find the manual you mention as kaffemaschinendoktor.de is not a valid URL.
From your description i assume that your kit didnt contain O-rings but V-rings, which have to be mounted in the right direction as opposed to O-rings.

The V-rings were in vogue for a time, but today its clear that they aren't better than O-rings in any way when used in the brewing group of a jura. The brew unit moves a bit lighter than with o-rings, but the V-rings are more often going completely broken.

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Quick Mill 05000 "Unique Edition", WMF Ecco

Sorry for pointing out the wrong URL, here's the complete link to the instruction I used; http://www.kaffeemaschinendoctor.de/download/REPS.pdf

The kit I bought was from BND Kafeestudio (ordered the kit 3-4 years ago), it was a "Wartungset XXL Premium" and the big o-rings (or v-rings?) are just like in the instructions in the above link.

I will order a standard kit now so I have that in stock at home when needed) and maybe some other parts.

Okay, interesting manual! (I even looked on www.kaffeemaschinendoctor.de before, but the manual you linked against is not mentioned on their own site).

The difference between O- and V-rings is nicely visible on the pictures 33 to 35.
33 shows an O-ring, 34 and 35 show a mounted V-ring.

The V-rings are also called "Lippendichtring" or "Nutring" in german.

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Quick Mill 05000 "Unique Edition", WMF Ecco

Therefore the drain valve is okay, but the upper sealing doesn't make her job.