Hi, My Worcester thermostat was playing up with the rotating dial. Got a new one and I’m trying to pair the new one but it doesn’t pair. They sent instructions how to do it but does anyone have any experience on this. On the boiler, there’s an installers menu and I go to the pairing and it doesn’t pair upon doing the thermostat instructions I need to do. I’m doing nothing wrong here and when I try to pair the old one back, it’ll pair instantly. Does the whole programmer receiver on the boiler need to be fully replaced in order to change a thermostat? If anyone knows a bit about this I’ll be happy to send pics across. Thanks.