Originally Posted by
bruce_miranda
With the nefit converter are you able to see variable Target Flows being set for the boiler based on OT? Because the work around which I previously used when I too couldn't get my Vaillant to fire with the R8810 was to set up the system with OT for boiler control and then a 2 zone valve configuration on Evohome. So Evohome would open the CH Valve using a BDR91 and then I would use the zone valve micro switch to fire the boiler, while the R8810 was dynamically setting the Target temperature.
This all worked quite well, till I figured out how to get the R8810 to fire the boiler directly.