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Thanks all for your replies. As far as what type of system i'm not sure what you mean. I'm only a general builder who dabbles a little in plumbing, so far as i've wired and connected up complete new systems, but would only describe this old system as being the the most common i normally come...

I need to replace an old sticking Honeywell V4043 2 port zone valve. I already have a new spare handy, but it is missing a wire. The old one has a total of 6 wires: blue, brown, gray, white, orange and green/yellow. The new one, and subsequently the only one my local merchant sells, is missing...