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 the white wire. Does anyone know if it's possible to install the new one even though it's missing the white wire, or do i need to source one with the correct wires?