Home Heating IoT Project - Software planning

For this project I want to be able to control the room heating in my house either manually or on a timed system.

I decided to plan it using a flowchart, as I couldn't get my head around the programming easily without visualising it.

Here's the first draft and I'm pleased how it turned out:

This image was made at lucidchart.com - so easy to use!

The earlier posts in this project can be found here: http://raspitech.blogspot.com/2016_10_01_archive.html