First, set up your router/modem and make sure it is connected to the internet.
For tado° heating devices
To connect the Internet Bridge to your new router or modem, follow these steps:
Plug the Ethernet cable coming from the Internet Bridge into an available Ethernet port in your router/modem.
Plug the USB power cable coming from the Internet Bridge into an available USB port in your router/modem.

If there are no available USB ports, use the provided adapter or any regular 5V USB power adapter to power the Internet Bridge via a power socket.

Once your Internet Bridge is successfully connected, your other tado° devices will automatically connect to the Internet Bridge.
If the Internet Bridge does not connect to the internet, learn more how to fix this.
For the tado° Smart AC control
The tadoº Smart AC Control will connect directly to your Wi-Fi.
Make sure that WLAN is activated on your new router/modem. To do so, refer to the router/modem’s user manual, if necessary.
If the Smart AC Control does not connect to your Wi-Fi, learn more how to fix this
More information:
The ‘Router’ LED on the Internet Bridge is blinking, what does it mean?