Hi all, Really struggling wiring up some thermostats. I have a combi boiler. The thermostat I removed was wired in as below; A grey wire and exposed earth wire weren't connected. Here's the instructions. Now I tried connecting as the instructions say, the thermostat powers on etc but it does not kick the central heating on! Found a user who connected as my picture below, doing it that way for me provides no power to the thermostat and it doesn't turn on or do anything! Can anyone advise? What am I doing wrong? The only way the unit powers up is with brown in 1 and black in 2.