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Well that was definitely team work. Wired up. Boiler on. Time will tell. But as nothing has gone bang, I am hopeful that is Job Done. I appreciate your help with this project. I am new to this site, but will surely need to come back when we get stuck with something else. Thank you so much!

My husband is about to replace our obsolete Switchmaster (6 wires) with Honeywell (5wire) to our Central Heating System. The Plumbing is sorted. However, all advice we have seen with regard to the wiring, doesn't adequately explain how to do it. We believe:- Switchmaster Blue to Honeywell...