Bosch VeroSelection 700 - No coffee - lots of air?

Howdy!

I have a Bosch VeroSelection 700 and I have had
problems with the device for a few days. At the beginning you could notice that with the cappuccino cover some steam comes out of the wall on the right side near the brewing unit. Later on, there was a loud hissing sound, and with the cappuccino cover the coffee became less and less at the end of the cover and had
quite a lot of bubbles (either air or too much heat?).

During the repeated test of hot water cover

I could also find quite a lot of bubbles.

The device has run through 5x Calc n Clean in the last few days, which did not bring any change. However, it was noticeable that in this mode, too,

a lot of air came out of the device,

especially via

the milk hose.

In the meantime, the coffee cover no longer worked at all. The milk of the cappuccino came

out of the nozzle normally, the coffee did not.

I then opened the device on the left

and took a look inside. It's

hard to believe, but afterwards the machine worked

normally

again for 3 cups

without any repair.

Now

the coffee cover no longer

works

.

I think by putting the device on its side to open

it, the device

worked

again for a short time. Why is that possible? Water comes out of the coffee jets
when you perform Calc n Clean
.
Does anyone have any idea what
to do in this case?
Many thanks in advance for
each answer.
Best regardsThomas

In case anyone's interested: It was the pulsation dampener.
Best regardsThomas

Thanks for your info... have just the same problem that comes with coffee only hot air, but no more water.