Hello, I live in the UK and my home has a oil fired boiler which is gravity fed. I bought a hive dual channel receiver as my home has a separate hot water tank. It turns out that the switching for the hot water is within the boiler outhouse so I will only be able to set up for a single channel. Is this still going to work with a dual channel receiver? I don't have a NC wire and after trying different configurations the boiler won't fire. I've placed the old box back on and everything works fine? Has anyone got any ideas? What's the right wiring configuration?