When the Smart AC Control has no Wi-Fi configuration, it’ll show a unique 4-digit code on its display.
When this code appears, please do the following:
Go to Wi-Fi settings on your iOS device.
Scroll down to the section Set up new device. tado° should be recognised as an accessory and be listed here.
Select tadoXXXX, then you’ll be redirected to the Apple Home app to complete the configuration there.
If you're not able to connect the Smart AC Control to Wi-Fi, please do the following:
Unplug your Smart AC Control.
Wait for one minute and plug it back in to restart the device.
Then follow the above steps.
Please note: only the Smart AC Control V3+ is compatible with HomeKit.
If you’re installing the Smart AC Control for the first time, its display will show the spanner symbol. You can continue your installation in the tado° app.
More information:
How can I configure the Wi-Fi settings for my Smart AC Control using my Android device or PC?