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Tado X wireless receiver without internet connection

Hello,

I just bought the Wireless Smart Thermostat X starter kit (Wireless Receiver X +  Wireless Temperature Sensor X) with some smart radiator valves and I thought that without an internet connection they would just follow the normal schedule.

But I tried and even if the valves and the wireless thermostat can talk to each other just fine without internet, the Wireless receiver X (which is the one actually connected to the boiler) doesn't engage heat mode so the boiler doesn't start even if one of the thermostats asks for it.

I connected first the thermostat and the valves with matter to a Homey Pro because I already use it as a thread border router for other devices and then added them to the tado app with the qr code just fine but the wireless receiver X doesn't have any matter QR code to use it to pair to another thread border router.

Is that the reason why without internet they cannot communicate with the wireless receiver?