From the conversation on github, I don’t know if you have a problem with the temperature of the water pump, if you want to change the temperature that water pump starts I think you should have to enter tpar and enter the password, that may be 1357
To see how to enter the tpar
MB100 board page and I think the parameter to change is th19
Regarding the turn on and turn off commands, Does J commands work?
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Edit
if you have puffer there is another water pumb Th59, and as you can see this manual is similar to NG01 manual, that you can find.
EDIT2
As I said before, my official Tiemme 4heat app on my old Tiemme board does not allow me to change the power, so the new command does not work
Edit3
I don’t have a hydro, but I think that by programming if the stove has a room temperature probe, the switch to modulation , you can choose that if it reaches the room temperature it goes to modulation and if the water temperature reaches the temperature as well. , and if the stove does not have a probe you can put a 10K NTC probe.
From your photo it seems that you have free pin 17 pin 18, if you put a probe and configure P74=4 you already have a room temperature probe, and if A01=1 when it reaches the room temperature it goes to modulation.
Since I don’t know anything about hydro, maybe another A1 should be selected.
From Mb100 board manual
I have chosen pins 17 16 IN2 because it says that a probe goes to those pins and they are free, if it does not work we would have to use the IN5 input Pin 24 Pin 25 and P70=15, and even I should try if it posible put P74=15
EDIT4
See if the black cable Pin 24 Pin 25 goes to the external socket to connect the thermostat, see if P70=4, if that happens I think that if you change P70=15, you have converted that thermostat input to a probe input, and it should appear on the menu TA
So if you want to have also a thermostat you can use pin 17 and 16
New Menus
EDIT 5
Briefly forget everything I said about pin 17 and 18 because I think the official wiring diagram of the MB100 board is wrong. if the black cable Pin 24 Pin 25 goes to the external socket to connect the thermostat, see if P70=4, if that happens I think that if you change P70=15, you have converted that thermostat input to a probe input, and it should appear on the menu TA, I would put a temperature probe and I would not change anything and maybe you can set that temperature through home assistant, commands A20493000000000000 or for old boards A21700000000000000 and see it matches to tA display
EDIT6
About probe if you search for example on Aliexpress temperature probe ntc 10k, you will find many with different look
https://www.aliexpress.com/item/32800546643.html
Edit 7
From this link you can download the technical manual for the Tiemme MB100 hydro board