Viessman 200-W and Tado wireless V3+ starter kit connection via KM-BUS
Yesterday the plumber was trying to connect the Viessman 200-W and the new Tado Wireless V3+ starter kit.
All Tado parts worked perfectly (bridge, wireless receiver, and the wireless sensor) however he was not able to connect the Viessman 200-W and the Tado via the Km-Bus (digital bus). He called Tado assistance and connected remotely to my wireless receiver to confirm that all was working well in the Tado). Viessman assistance was closed at the time he called the technical assistance, hence he could not talk to Viessman.
He connected the Tado system as a relay and it worked well to turn it on and off.
QUESTION1 : Do you know if it is worthy to ask them to come back again and connect via KM-BUS? I do not know what extra I will get in comparison with being a relay.
QUESTION 2: DO you know why it did not work out well? Is there any link or video to watch and learn about it?
Thanks in advance for your help.
For reference: I am located in Belgium