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I'm putting a Nest thermostat in, but the wiring diagram that comes with it only shows a 5 wire valve.  I'm pretty sure that I've worked out how to do it now though - I found a table online that shows which colour wires on a 5 wire valve relate to which colour wires on a 6 wire valve. And the...

Hi all, this is my first post, so please go easy on me... I'm trying to understand how my central heating system is wired - I'm nearly there, but I need to see a wiring diagram for my Switchmaster mid-position valve. I've found that most valves of this type have 4 wires plus an earth - this...