Hi, just installed my Google nest learning and everything seems to be working except when I call for heat from thermostat the boiler does not fire up. The Heatlink clicks as it should but no boiler fire (works fine on manual) I have left the original thermostat/wiring in place which currently still operates the boiler as advertised so I know it’s something to do with this. What wiring do I need to add/remove for the nest thermostat to fire up the boiler? (The original plan was to wire up nest thermostat in place of the old one but my wiring centre is a nightmare for access and trying to work out what’s what)
