Circulation timer on the heater

Hello everyone,
We have a timer switch for the circulation on the heating, see picture.
But no matter how I set it, it never circulates as it should. I just don't understand it!
You have three modes you can set: permanently on, permanently off, or according to setting (middle).
I set it so that it should circulate, for example, tomorrow between about 6 and 9:00 a.m. But it doesn't. Of course, I also set the current time accordingly on the small arrow. I have tried everything.
What am I doing wrong?
At our heating system, we also have the option to adjust the circulation. See another photo.
According to the heating engineer, this does not apply if the manual timer switch is activated.

It really never works as I set it, cold water for 1 minute at 6:30 in the morning.

FRUSTRATION!
Do you have any idea what this could be? Thank you very much

Does the timer switch still work (at all)?

Does the timer switch still work (at all)?

The thing (and our heating) is 1.5 years old, I really hope it works

...
I hope
...

"You can believe and hope in church."
or
"Believing/hoping is not knowing."

I would have suspected now - based on the analog construction - that it is older than 1.5 years. But even after 1.5 years things can be defective - was just a hint :)
Nothing to say that it's similar here as with the one with "the empty tank."

"One can believe and hope in church."
or
"Believing/hoping is not knowing."

I would have suspected now - due to the analogous design - that it is older than 1.5 years. But even after 1.5 years things can be defective - it was just a hint :)
Nothing that it is similar here to the one with "the empty tank."

I wrote to our heating engineer to have a look at it.

But it does not.

What does it do then?
Circulate at the wrong time? Not circulate at all?