A command to a tado° product via HomeKit (e.g. via the Apple Home App or via Siri voice recognition) will be treated by tado° as a manual input to the device. This means that tado° switches to "Manual Control" using the target temperature set via HomeKit.
Generally HomeKit only allows you to access HomeKit-enabled devices from your iOS devices whilst you are at home. To control a HomeKit device from anywhere an Apple TV (4th generation) is required. You can learn more about this on the dedicated Apple HomeKit Website.
For more information about tado° and HomeKit refer to our HomeKit Section.