Boiler modulation on Worcester Bosch 38cdi classic erp
Hello to the community. I’m hoping someone more knowledgeable than myself can shed some light on this. I have had the above combi boiler for 5 years now and it has been controlled using the supplied Worcester comfort 11 RF wireless thermostat/programmer and the associated wireless receiver unit which was fitted into the front of the boiler. In an effort to gain more control of how and when different rooms in the house were heated I opted to fit the Tado heating control system. I duly purchased the Tado starter kit V3+ which consisted of the internet bridge, a smart wireless thermostat with stand and a programmer with hot water control. I also purchased 6 smart radiator thermostats. The system was installed by me, replacing the Worcester controls and has been working great for a week now.
However, I have now discovered that my boiler is a modulating boiler, and I believe that is how it was operating when the old controls were fitted. Now that the Tado controls are running the show, I’m not sure that is still the case. The only connection I have between the boiler and the new Tado programmer is a 4 core flex of which only 3 cores are used, and they are connected to the neutral, live and ch NO terminals in the programmer, with a link fitted between the live and ch COM terminal. I may well be wrong here, but I don’t see how that could be controlling the boiler using modulation?
So in essence what I am asking is, have I now lost modulation control for the boiler by fitting the Tado system? If so, is it possible to connect the Tado controls I currently have in a different way to restore modulation? If not is there some way of restoring modulation control by adding additional Tado controls? Or am I just talking rubbish? Any help with this would be greatly appreciated.