Okofen temperature validation

[Florent38]

Hello everybody

I am a new owner of a pellematic 15kw with external sensor, ambient and 3 valve controlled channels. It dates from 2007.
I bought Okofen the user doc but I think to miss something on the first basic settings, where my coming on this forum.
I was inspired by the latter to refine (finally I hoped) one of the basic 4 prog.
Time slots it seems ok but the temperatures of comfort and lowered ... Nothing to do.
I thought it validated itself after modification, that's what I understood from the doc.
In short, I select my temperature with the "sun" button for comfort, the value changes and when I go back to it, I still have 18,5. I tried to validate with other combinations but nothing to do.
The problem is that the comfort setpoint temperature is so low that it does not even start the boiler :-(
I hope I was a bit clear and thank you to those who will take the time to answer me.

In advance a big thank you

Florent