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Cant read the part number its covered in rust, have spoken with 2 plumbing merchants and they both confirmed that the 28mm valve (V4043H1106) does have 6 wires. I will let you know tomorrow when it arrives. The original 22mm valve had 5 wires but was wired to a home made control unit which has...

Thanks for the reply, there is a 22mm leaking valve already in the system, I thought straight replacement, should of known nothing is simple - I think the 22mm valve will be heading E-Bay's way!!

Have just bought a Honeywell 2 port valve (V4043H1056) to use in a 'C' plan system - the plan shows 6 wires from valve Grey, Blue, G/Yellow, Brown, White, Orange, mine has 5 wires (no White). Can anyone let me know the correct way to wire the 'C' plan using 5 wires (Grey, Blue, G/Yellow, Brown...