Voila, j'ai recu une réponse sur l'autre forum, et ce que vous voyez comme problème est "normal" ...
Ce n'est pas supporté d'avoir un Evotouch SANS HR92's dans la zone où le evotouch se trouve, et des HR92's dans les autres zones. Il faut obligatoirement avoir un HR92 dans la zone ou le Evotouch se trouve, ensuite vous pourrez utiliser d'autres HR92's dans les autres zones.
Je ne sais pas combien de radiateurs vous avez dans la zone ou se trouve le Evotouch, mais il faudra acheter une HR92 et l'installer dans cette zone pour résoudre le "problème"
J'ai posé des questions additionelles, mais voici la réponse originale :
"The configuration he's trying to achieve is not supported.
With Evohome you can have a single zone without any TRV which just controls a boiler like a traditional wall thermostat, however as soon as you start adding HR92's in additional zones you MUST have an actuator for every zone other than just the main boiler relay. This could be an HR92 or a zone valve etc...
So in short, it can't be done. An HR92 will have to be added to the original zone to continue to be able to control it when additional zones are added to the system.
Yes, there are some hacks to try to work around this (including double binding, binding a device then deleting it again etc) and I've tried them myself for a while as I was in exactly the same situation when I first started expanding my system, however these hacks don't work properly and are definitely not supported by Honeywell. I just had hours of headaches and constant comms errors being reported."