Ok so I moved my boiler upstairs it's all working fine for hot water but can't get heating to work I have a wireless thermostat connected but it's not bringing the heating on and it's got me thinking I've not wired it in correctly, I have 2 cables coming from the bottom of the boiler, 1 is the mains plug for the boiler and the other is for the thermostat it's just a 3 core flex cable and I have wired it in to the receiver live to live neutral to neutral and I have cut off the earth, it then says to put a link wire between COM and live which I have and then got the thermostat and called for heat, 3 seconds later the green light clicks on (calling for heat) but there is no life from boiler, have I done something wrong??