I suspect that there are spinning plates we don’t know about.
1/
The wall controllers are static and connect at all time to WiFi.
2/
The app, which functions on a mobile device, connects to WiFi and thus, through the same LAN to the heating system to provided behaviour instructions.
3/
The app operator is able to provide a first instance instance instruction the the wall controllers and then the app displays an error message.
The above is what we’ve been told and accept at face value with the evidence offered.
What we don’t know:
A/
If the mobile device is turned off and/or the app is deactivated and then it is all on/reactivated, is there a connection from the app to the controllers? Logically there should be because step 2 can be performed. Please confirm around this situation.
B/
Is the wretched CONNECT app active on any mobile device? If also, what happens if the wretched CONNECT app is deleted and all Smart/Intelligent WiFi settings in the Hub turned off?
C/
Has it ever worked with your Hub?