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.
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