If you’ve changed your router or are having trouble connecting the Smart AC Control to your Wi-Fi network, please do the following:
When your Smart AC Control shows the unique 4-digit code, go to Settings > Rooms & Devices in the tado° app, and
select the room in which the Smart AC Control is located.
Select Update Wi-Fi Settings, then Next, and follow the instructions in the app.
Make sure that all your devices are connected to a 2.4 GHz Wi-Fi network.
If none of the above solves the problem, try to reconfigure the Wi-Fi settings of your Smart AC Control as explained in the articles below: