How do I turn my heating off on the Halo Combi RF / Halo Combi Wi-Fi?

Press the right hand button to enter the mode menu, scroll to select OFF and push the dial to confirm.

If you have the Halo Combi Wi-Fi control you can also turn the heating off remotely in the Halo app, simply tap the mode lozenge which is located in the centre just below the temperature ring and select OFF from the pop up menu.