Saunier Duval Semia F21: Adjusting DHW Temperature (ECO mode) & Upper Right Corner Switches

Hello Dear Group
I have a problem with the Saunier Duval Semia F21 stove.
Namely, it is about hot water
If I set the hot water knob vertically, i.e. on ECO, in front of the red field, I have very hot water, not hot, if I set the knob for 2-3 hours, the water is slightly less hot than before.
Please tell me because I don't know what the settings of these switches should look like in the upper right corner (red rectangle). I would like to add that from the left, four are down and the fifth is up.
I don't understand this instruction below. How it should be?


Added after 11 [minutes]:

I just found the manual on the network and point 7.3 says it, I understand that I have to set the switch No. 3 down, then set the temperature with the potentiometer to a higher temperature, and then turn the switch No. 3 down?

As you write: switch 3 up; 1,2,4 down; 5 doesn't matter - and then you set the temperature with the knob

That's what I did, but ..
the stove heats the water differently, sometimes it is hot, sometimes warm - at the same set temperature.
besides, there was a failure several times when the hot water tap was turned on.
Maybe the gas nozzles are clogged?
yesterday I cleaned them with a vacuum cleaner and then with compressed air. Maybe I hurt them with this?

I solved the case myself.
It was all dirty nozzles, the other half of them to be exact.
I looked into the stove, inside while it was starting / trying to start, I look and the other half of the nozzles have no flame at all and hence the failures.
At the moment, after cleaning, there is hot water and no stove breakdown.

I just wonder if in other cases of the lack of hot water the nozzles were checked at other users?
I greet everyone.