The fact is, that I have aquired a central heating system which needed the Hot water to be switched off to allow the heating to come on.
I aquired a guide wiring diagram based on a Drayton MAI/679-3, but my system has a Honeywell V4073A.
Therefor, having checked the wiring on my system based on the Drayton diagram, I would like find out if the Honeywell uses not only the same number of coloured cables, but has exactly the same concept as the Drayton.
If so, it will give me the chance to test the system and confirm if it is the valve at fault.
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