Krups EA8250: Brewing punch pushes up

Brew piston above (here with new gaskets, the original gaskets were black):

Drainage valve and water distributor:

And one last picture: the upper part of the hydraulic cylinder in close-up:

Super!! I'm glad to see her running again ....

The had really still few references run, there it must still loosely continue! :-)

MoinMoin,
yes, thanks, I was also happy, especially about the good coffee at the weekend :-)

yes, when I read here so that with the one or other DeLonghi machine the first problems after > 10000 covers are not even 2800 of my machine already quite puny.
But maybe the part runs now for the next 5 years without problems, then it fits again :-)
greetings and a good week still

Hello thanks for the message.
As such something completely different than I have thought.
Yes it should probably run again for a long time and if not, you will set it again in motion.
MfG Chris

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QUOTE (Kaffeematz @ Thursday, 27 November 2014, 07:34)

Hi all, my Krups has been on my workbench for a few weeks now. Whenever I find time, I test and try something new to get the machine going again. The problem: During the rinsing process (and thus presumably also in the brewing process), the upper brewing plunger pushes almost completely out of the brewing chamber. The first O-ring is then completely visible. Of course, the water that is in the brewing chamber then splashes past the brewing piston into the interior of the machine. From the actual coffee spout at the top of the brewing plunger comes no drop of water. The problem has been described here in the forum a few times. I have implemented or checked all the points mentioned there, unfortunately without success. Work so far: - Drainage valve checked and re-greased - Hose drainage valve-brew chamber flushed - Seals of the entire brewing unit renewed - Hydraulic cylinder disassembled, springs cleaned, new spring steel ring mounted on top (the old one was only in a few individual parts), completely provided with new seals, greased and reassembled - Water filter cleaned - Water distributor opened, cleaned and reassembled - The Crema'seal' in the brew plunger and the strainer in the brew plunger checked and cleaned To the problem: As described above, the upper brew plunger is being pushed out of the brew chamber. Interestingly, there is no water loss anywhere in the machine during this process. - The hydraulic cylinder is completely tight at the top and bottom - There is also no water leakage at the water manifold - The drain valve is also tight Does anyone have any ideas what else I could check? Basically, I have only one idea left: Replace the pump. - Because the pressure in the brewing chamber cannot be too high, otherwise the water pressure would open the crema 'valve' in the brew head and rinse water would come out of the coffee spout. - A leak in the hydraulic cylinder would have to be visible, after all, more than 2 drops of water would have to come out How do you see it, are my assumptions so correct? But what makes me hesitate here: The dilemma with the machine started with a 'hanging' brewing plunger. The brewing plunger got stuck in the brewing chamber and did not release the coffee cake or the drawer. This problem was solved after cleaning the water distributor and the general overhaul of the hydraulic cylinder. After the problem of the hanging brewing plunger was solved, the problem described here occurred during the test rinse cycle. Until the problem of the hanging brewing plunger, however, the machine always ran without problems. So why should the pressure generated by the pump suddenly no longer be sufficient? For me, this again suggests a pressure loss in the hydraulic cylinder. But where does the pressure/water go? Or have I perhaps installed the springs in the hydraulic cylinder incorrectly and am thus generating too much pressure upwards? Could someone send me a picture of a functioning hydraulic cylinder? I can only find pictures of disassembled cylinders, but they don't give much information about the assembly or the location of the springs. By the way, it's a pity that such a good machine is so fragile because of a few cents saved on material costs. 2 euros more invested and the machine would work for 10 years without any problems. Quality is probably very very rare today Thanks in advance for any ideas and tips!

Hi,
I actually have the exact same problem with my Krups EA9000.
However, I would think the flowmeter works for me because the amount of water set ends up in the cup as well.
What I have tried so far:
I have replaced the O rings on the brew piston, replaced drain valve, tested flowmeter, disassembled and cleaned water manifold.
I have also removed and cleaned the screens on the brew piston and also the screen at the bottom of the brew chamber/punch.
The condenser so the aluminum part was also disassembled and cleaned.
Despite all this, the error remains.

Hot water works perfectly also the set cup amount in ml is accurate.
Coffee runs completely down the brewing chamber and no drop arrives in the cup.
The upper brewing plunger always moves up a bit during the brewing process and I think that's why the coffee then just runs down the brewing group.
I am at a loss with this machine. Do you have maybe just a tip what I could still do?

In the service menu I have also reset the settings. But it has all brought nothing.

I had the same problem and after changing all o-rings the machine even broke the metal part holding the piston. After no logical explanation left I made a few tests and noticed that the grinder fills the brewing chamber almost to the edge. With more coffee inside the mechanism has hard time compressing it. When the brewing process starts the excessive coffee provides more resistance to the high pressure water and pushes the piston upwards. After factory settings reset everything works fine. Here is the link to an useful page with the reset procedure explained: https://doctorcafetera.com/en/krups-troubleshooting
Hope it helps.
Cheers!

Bringing old post up from the dead.
I seem to have similar issue.

Piston hanger lifting up under pressure, causing water to go everywhere.

New piston. New rings, same problem.

The only way I can get it to brew without leaking is by removing the piston screen and rubber plug.

After cleaning the piston screen and plug I can get it to brew a full cup of water.

As soon as coffee grinds enter camber, the screen gets clogged enough making the piston hanger rise until coffee water sprays.

I dont think it's a flow or pressure problem as it will brew without coffee grins, but what do I know.