Nivona 725

Hello,

I have a problem with my coffee machine and it will soon be one with me if it continues like this.
I often get the error message bean container fill. The coffee was ground very coarsely and the pomace was very loose. Then I changed the worn grinder to a new one. The grinding degree is now correct again and the pomace is also firmly pressed again.
The error message "Fill beans" still exists. Sometimes the machine can be outwitted with strength degree Mild or a double cover.
When I look through the powder shaft into the brewing group, the powder container is almost completely felt, the powder quantity should be sufficient.
I suspect that the powder quantity is not correctly recorded. How is the powder quantity determined by the machine? Can a sensor be defective here?
How can I correct the error?

Gruß Ralph

Either there is a sensor installed which counts its impulses via magnets (as well as with the flowmeter) or the drawn current (A) is measured via the power board (via a controller) Check the grinder again and clean it everywhere with compressed air.
SuFu at Google helps with the disassembly of the grinder.
MfG Chris

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Thanks Chris for the answer.
As said the grinder is new. If at the grinder which is measured, then at most over the current, since only 2 cables are connected, whereby the one cable still has such a small temperature sensor. The feeler holder of the old M did not fit on the new M, I then attached the feeler with tape. This sensor protects m.A. after only the grinding mechanism from overload.
Are switches installed somewhere on the brewing group, e.g. for end positions or is the BG driven via a stepper motor?

Gruß Ralph

Hello Ralph,

at the best you have a look at the Siemens Forum. The models of the Surpresso series (S40, S60, etc.) as well as the Bosch Benvenuto series are mostly identical. If the grinder is new, the fault is probably due to the microswitches.

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Gruß Rudi

Hello,

the tip with Siemens or Bosch was super.
For the positions of the brewing manikin there are probably two switches installed, one of which is also responsible for the coffee quantity.
At a spare parts dealer I found repair instructions for Siemens/Bosch devices.
Including a picture with description of the construction of the machine. The switch is located at the top of the partition wall to the brewing group and is accessible at least at the switching cam when BG is dismantled.
I operated the switch a few times by hand (with the machine switched off) and additionally treated it with contact spray. The machine works fine again until now.
I will still get two spare switches, which is not a big investment at about 3,-€ / pce.

Gruß Ralph

Hello Ralph,

is glad that you could find the error, and thanks for the feedback.

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Gruß Rudi

After a tons of browsing and debugging finally I got the real solution
to my similar problem with a Saeco Minuto HD8763 coffee machine:
the root cause was a bad hall sensor and a weak magnet at the grinder toothwheel:
http://i.fixya.net/uploads/images/replace-magnet-hoey1jvz3uhc2z5y4gktfnry-3-0_3.jpg
(the left magnet which was removed from it's original place).
The upper one was okay and down under there is the replacement
magnet which I made from a piece of HDD neodymium magnet and glued to fix it.
The original hall sensor was marked as "210k 3491" ("HAL506K" based on
some other service manuals) and the new one was a
cheap non-smd but same size, unipolar "TLE4905" type.