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    Replace 6 wire Switchmaster VA1 with 5 wire Honeywell V4073A

    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...
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