To reset the HomeKit configuration of the Smart AC Control V3+, you need to:

  1. remove the device from the Apple Home app. Go to Rooms, select the accessory you want to remove, and scroll down to select Remove Accessory. Then, select Remove.

  2. remove the device from the tado° Home.

  3. unplug the Smart AC Control, wait for one minute, and plug it back in to restart the device.

  4. set up the Smart AC Control V3+ with HomeKit again.

More information:

My Smart AC Control V3+ is not connecting to HomeKit. How can I fix this?

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