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Humm, downstairs didn't go as well. I managed to the the heat link clicking when turned the themostate up, but it was not triggering the valve or pump to come on. Looks likes it not getting power, so my wiring is not right. See pic below, I take it this must use the neutral wire to bridge the...

So far so good. Got the upstairs one all set up and working great! I made all the connections at the wall wiring center and didn't touch the megaflo wiring centre. One issue I came across was once wired up the valve was working but the boiler did not fire, so I put back the old brown call for...

Can I just check my thinking? So in Z2 if I trace the two wires that go to the themostate, remove these in the MWC to use for the 12v power, and then add new wires going to the Nest Heat link where these wires were located. That should do it?

Also what do you mean by MWC? Ignore this!! Megaflo wiring centre!

Great thanks so much. Just popping out to work so will look at this when I get home. Just so I can check, you are saying to make the connections at the megaflo wiring centre and not at the one on the wall? Thanks again :)

Thanks but could do with a bit more advice than that :)

If anyone needs anymore pictures of anything let me know. Keen to get this up and running over the next few days :) Thanks

Thanks, they are pretty big!

Right here we go guys: Airing cupboard with Megaflo (you can see the wiring centre on the left hand wall at the bottom): https://www.dropbox.com/s/0079b1s3ljobn9c/megaflo.JPG?dl=0 Valves (the white one is upstairs/zone 2, and the one under that is downstairs/zone 1. The lower one is hot...