Help! I am swapping out a boss therm thermostat for a hive on my Worcester Greenstar Heatslave 18/25. I have wired it all up, everything is talking to each other, the boiler is set to “on” for heating and water, the boiler is working for hot water but it just won’t come on for heating! Any ideas? Wiring pictures attached plus the picture we used to help us do the wiring.