w.Intercom = i;Can't set a CH setpoint temperature — tado° Community

Can't set a CH setpoint temperature

Hello everybody, I've got a tado smart thermostat and a set of 5 tvrs. The thermostat is connected digitally to a Chaffoteaux PIGMA ADVANCE EXT 25 via a digital bus (D57). I can control everything, including the hot water but I have no clue on how to control the CH setpoint temperature.

If I disconnect the thermostat and I set the temp on the boiler's screen, everything is fine but as soon as the thermostat is reconnected, the temperature jumps to 65° and I have no control over it (if I change it from the boiler with the thermostat connected, it'll jump back up immediately).

The screen you see is from https://model-selector.tado.com/system-check and it's of no help since it tells me that "Temperature limit should be set on the boiler " but, as I said, i'ts impossible to do so.

What am I doing wrong? Thanks