I had new boiler (Worcester Greenstar Junior 28I Combi Boiler Natural Gas) installed and I have connected it to the existing Honeywell T6360 room stat. The boiler has WB digital programmer fitted. Now it looks like the thermostat does not control the heating. i mean that the boiler is running constantly no matter what temperature is set on the stat. the boiler and the stat are connected by two wires cable at the moment. I have connected them according to the boiler's manual. Can anyone tell me what have I done wrong? Many thanks