Siemens espresso machine TK76K573 - no steam production for frothing milk

I have a problem with the Siemens TK76K573 coffee machine.
Coffee is brewed normally, but there is a problem with steam production ...

It started a few months ago with the "short milk system cleaning" function not working. It was heard that the machine was "preparing steam", the cleaning process began, but the machine finished after about 1-2 seconds. (normally the process should take about 10 seconds)
Now the cappuccino frothing milk has stopped working.
The symptom is exactly as above - the machine "prepares steam", begins to froth milk, but after about 1-2 seconds. interrupts the process. Normally followed by coffee brewing, but here the interruption of the milk frothing process interrupts the entire capuccino preparation procedure - previously ground and prepared coffee is thrown into the container by the machine, brewing does not even start ...

However, if I choose non-dairy coffee, then the machine makes it without a problem ...
It looks as if there is a problem with the "steam circuit" - because all processes that use the milk suction tube (i.e. frothing milk, heating milk, cleaning the milk system) do not work properly. The operation of all these processes is identical to the one described above.

I will add that the milk frother, suction tube circumference, etc. are cleaned regularly.
The machine itself is also regularly descaled (liquid) and cleaned (tablets).

I am asking for help, because my wife without capuccino / late is unable to function

Espresso for the nozzle opening upwards or unscrewed?

Is it a foamer module?
For the foamer - it is currently a screw version with a seal (O-ring).
Originally it was a push-in version, but a few years ago the foamer was replaced with a screwed version (tighter).

The frother is such, this upper part (in the photo on the right) is unscrewed.
The suction tube is connected to this connection from the side (pictured above).

This is exactly what I meant ...
Has the vent valve inside the espresso machine of a new construction been replaced with the foamer?

Is the fulfillment process too short in the device or does it just take too little milk?

No, only the foamer was replaced, nothing was exchanged inside the machine.
After replacing the foamer, the machine worked perfectly for several years.

The thing is that the very process of collecting (foaming) milk is too short - as I wrote about 1-2 seconds.
During this time, the milk collects and foam properly, only instead of a few seconds (as before) now it lasts less than 2 seconds ...

And is the amount of milk not changed in the cappuccino settings?

No...
Besides, it's not just about cappuccino. It behaves in the same way (i.e. for 1-2 seconds) any other function taking the frother hose - even the milk system cleaning function, which simply draws water from the cup out to rinse the frother, or the "warm milk" function, which should suck milk and heat it without foaming ... Each of these functions starts for 1-2 sec. and ends ...

On the foamer before replacement (those with a push-in rather than a screw-on lid) the symptoms were different. The machine then carried out the entire foaming procedure, only that the milk did not foam, because the foamer was leaking and sucked it poorly. In any case, the procedure itself lasted as long as it should, i.e. several seconds.

Now just after 1-2 sec. the suction procedure is interrupted. It is as if the machine was detecting some error and stopping it.
Therefore, he doesn't stop making cappuccino, he just throws away the prepared and un-brewed coffee. So in turn:
- they had coffee
- beat in the brew unit
- prepares a pair
- begins to suck the milk
- after 1-2 sec interrupts milk suction
- doesn't stop making coffee, just throws away dry, pre-ground coffee into the waste

I'm sorry, apparently the temperature was a bit distracting me ...

Naturally purely hypothetical - slight leakage from the steam nozzle clutch.
Centrally below it is a small electronic board (I suspect its placement is deliberate) and small water leaks cause anomalies.
The second hypothesis - with the pump's impulse operation, the flow meter incorrectly counts the impulses interrupting the brewing process.

It's great that there are some hypotheses. Thanks!
But one thing puzzles me ... As I mentioned at the beginning, the failure occurred in two stages.
- a few months ago milk system cleaning (i.e. taking water from a cup to rinse foamer) and milk heating stopped working; at that time cappuccino and latte were completely normal (i.e. foaming milk worked)
- milk frothing has stopped working now

What connects and divides these two processes?
I mean the process of taking liquid without foaming (rinsing water and milk to be heated) and collecting milk with foaming.
Maybe it will help to track the source of the problem?

Because these two hypotheses ... wouldn't it be that if it was moisture condensing on the plate or flow meter - then everything would not stop working. And for several months foaming worked, while downloading without foaming - at all ...

Everything he writes is purely hypothetical .. I can only direct but not seeing the device, please be aware of my mistake all the time ..

The device has a so-called multifunctional valve ...
It switches the valves by an electric motor, directing the water to the brewing unit to the nozzle .. - from what I remember on the nozzles this valve has three settings and two completely different channels supplying it water, a few plus additionally its third setting is to attach the aeration.
Earlier, the leak could be caused by one of the settings .. Over time, a second leak occurred on the second setting of the multifunction valve ..
Naturally, as I mentioned - purely hypothetical

Hello,
I have a problem with the Bosch CTES32 espresso machine, namely the espresso machine does not heat up, otherwise everything works correctly. When making coffee, the coffee was made with coffee beans, then it only releases cold water, when you try to release hot water, the message Water heating appears on the display and after a while the coffee returns to its initial state. Maybe someone will advise what the problem is or how to check if the heater is damaged. I have my coffee machine ready, if anyone needs it, I can make photos.
Regards

kesy1 provide the exact model from the nameplate.

I have two such espresso machines in the office, they look almost identical. The damaged one is Bosch No. TES50321RW / 12 Type CTES32, and the other functional one and the one bought in the store is TES50129RW / 06

unscrew the flow meter and check if the fan has hung up,
https://north.pl/karta/przeplywomierz-komplet...kawy-bosch-tes50321rw-12,21Z-TH-CMMF-GII.html
then check the fuses on the heater.
https://north.pl/karta/przeplywomierz-komplet...kawy-bosch-tes50321rw-12,21Z-TH-CMMF-GII.html

and how to check these fuses and where they are
Regards

We pass each other in posts, Pe.te describe the solution and let's close this topic.

Thanks to the advice of my colleague bosman116 I was able to solve the problem with the lack of foaming milk, described at the beginning of the thread.

The problem was the stony / contaminated water path between the valve and the steam outlet nozzles (nozzles at the back behind the foamer).
I used the intensive cleaning procedure of this episode proposed by my colleague bosman116 - it helped 100%.

Steps to follow in order:
1. Start the machine
2. Pour 800ml water and 200ml descaler (remove filter, if present)
3. Run hot water for several seconds
4. Remove the milk frother
5. Use a long, thin screwdriver to press the frother presence switch (top, left near the nozzles)
6. Secure the display (with a cloth, towel) so that escaping steam does not get wet on the module
7. Start frothing milk
8. Worn out a toothbrush (preferably small, for children) while escaping steam with water, clean the nozzles (those at the back, behind the frother) thoroughly but gently
9. CAUTION - do not drink milk because it will be with a descaler
10. If the machine does not interrupt the foaming process, it means that it worked; if not, repeat the process
11. Finally, perform the standard Calc'n'Clean procedure to flush the descaler from the system.

Additional remarks:
a) Be careful of the frother lid (the one with the inscription "Siemens"); concentrated descaler escaping with steam, condensation can damage the metal surface and destroy the logo (it happened to me - I had to replace the cover with a new one)
b) Due to the large amount of steam, the diode module may light up, illuminating the area near the nozzles during coffee brewing (this happened to me - this module is not well protected against moisture), as a result of which the diode will flash instead of a constant light; if this happens - you have to remove the foamer casing (as described in another thread) and dry the diode module (this is an ordinary, small printed circuit board)