Vailant Boiler Hive heating not turning on

Hi all, Apologies in advance for the messy drawing.

I currently have a Vailant ecotec 637 with a megaflo system.
I had installed the hive system about a month ago and it all seemed fine until i recently tried to use the heating and it didnt activate. I had disconnected the wires for the old thermostat and have tried using schematics found in this forum to try to get it to work but cannot seem to find the issue.

The hot water runs as normal and works when activated however the heating doesnt turn on when activated.

I have drawn a diagram attached below and was wondering if anybody could help please.

Orange from heating valve needs to go to the same terminal as the orange on the hot water water valve

Thank you! That got it sorted!