Siemens Surpresso S40 - Coffee not available

Hello everyone!

I have a problem with my coffee machine "Siemens Surpresso S40" and hope that you can help me. The machine now has around 10,000 covers, so it is no longer the very latest.

For some time there has been a small problem. When I press the button to make coffee, the coffee is first ground normally and the brewing unit moves into position. Then pressure is built up and that's it. The process is aborted and the coffee powder falls into the container. This happened more often in the past but only for a short time. After that, everything was back to normal. Only now nothing works. The error occurs permanently.
I replaced the holding-down device and the drainage valve so far, then I could get 4-5 coffees and now nothing works again. The same mistake.

With powdered coffee, or completely without powder, the same problem. I have also tried different degrees of grinding but always the same. The water pump works or at least so far that I get hot water from the steam valve.

I have the feeling that a lot of pressure is built up when the powder is pressed (it sounds like this).
Is there any way to adjust the pressure?
Or has anyone ever had a similar problem and can help me? An error on the display is not shown by the way. The machine "pretends" as if a coffee had come out normally.

Sorry, if there was a similar contribution, I didn't know what to do with the Sufu now.

Many thanks for your help

Hello, there are some bugs.
1. disassemble brewing unit completely and clean everything.
2. pump too weak or at the end of its life cycle.
3. adjust video about Youtube here, so you can hear and see what exactly happens.

MfG Chris

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So the brewing unit has already been completely dismantled and cleaned. At this point it became apparent that the hold-down device was broken. This one was already exchanged.

That with the pump was also my guess. But since I have already replaced the hold-down and drainage valve, I wanted to ask here before I invest any more money.

This with Youtube is a very good idea. Here is the link to the video of my coffee machine. First there is the start, then the attempt to make a coffee and finally hot water (which strangely works).

So I suspect that the upper microswitch is defective, or one of the microswitches inside the drive is not properly started/switched.
Please check these microswitches, when actuated they should switch quickly.

This link is only an indication, there are many other fully automatic coffee machine spare parts dealers on the net.

http://www.coffeemakers.de/Bosch-Mikroscha...-Benvenuto-1993

MfG Chris

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Hello,

after I finally got the chance to disassemble the machine once more and to test the microswitches I noticed that one is not switching properly anymore. In fact, it was the upper microswitch that is no longer fully pushed through. The still actuated switching path was obviously not sufficient.

I changed the microswitch now and the coffee machine is running again

Many thanks for the tips

Thanks for the feedback.

MfG Chris

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I have exactly this problem. Where do I find the upper pressure switch?

I mean, of course, "microswitch.

There you take off the left side wall after the back wall is removed. The microswitch is at the top right. It is switched by the switch flag of the brewing unit at the top dead center. The other two switches are located under the Brueh Group drive cover. This cover must be carefully levered open with a small screwdriver by slightly lifting the plastic clips.

HWS

Ah! I am curious, because I had recently replaced the hold-down device. I ordered one of those switches now and I'm curious whether it was "that. Then call me back here. Many thanks for the time being! Would be a pity for the great machine.

like this I changed the switch now. The old one didn't look so great anymore. But, unfortunately, the problem persists. I describe it briefly:

When pressing the coffee button (I always simulate powdered coffee to avoid grinding beans senselessly), the gray driver on top of the hold-down device starts moving after a few seconds if it works and gradually presses down the microswitch (as well as probably the coffee). However, the water flow starts already before or not at all! If it does not work, the sound of the water pump is missing and the WITHER for the microswitch does not start moving either. That means, somehow it can't really be the upper switch.

Do you understand that? The problem is also not dependent on any factors that can be influenced, so it occurs sometimes and then again not. Can it be the "bottom microswitches"? Can I get these here, too? Or is the brewing group perhaps too stiff? (I cleaned it the other day and exchanged the hold-down device as I said...).

Thanks for all the info...!

See if the little wheel in the small white turbine turns easily. The turbine can be opened by turning the top counterclockwise. So clean the turbine so that the wheel rotates easily when blowing it in.

HWS

Hello, if the brewing unit has no ground coffee, it stops the process.
The one with the " doesn't want to waste beans" or even grind uselessly can't be.

So it's hard all the way from the standing grasp and without a glass ball.

MfG Chris

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Hi @HWS and @Chris,

@HWS: Where can I find this turbine? Sorry if the question is stupid.

@@Chris: There is a function on the Surpresso S20 where you can open a lid in the upper right corner and theoretically fill in powdered coffee. Whether you do that in the end or not, it doesn't matter - in case of doubt you get a cup of hot water. With me every few times, then again not.

Thanks already times,

-Marcus

First you put down the back wall, then you unscrew the 2 screws on the front cover of the machine. The metal cover must first be pulled down to the rear. Then the 2 screws at the front come to light. Then you pull this cover back. Then you can, seen from the front, pull out the left side wall to the back. Now you can see this white plastic turbine near the pump.
If you just want to let out a hot cup without any powder, the device will definitely stop the brewing process. Because without powder the press pressure is naturally not right. The upper switch on the Bruehkopf does not trigger. Well, Chris is right. In any case you have to work with powder or powder from the mill.