New install of Nest (3rd gen) with Greenstar 25i - Help - Not working

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Hi All,

I finally got around to installing my Nest 3rd Gen, replacing a wireless digistat RF1.

I also seem to have a double set of live/neutral wires and 3 for earth, I copied this exactly from the old system/wiring matching the numbers. There was that loose blue wire before unless it came up when I removed the lid...which seems odd given there is not one thread.

My heatlink powers up, connects to the nest and 'clicks' when I ask the nest to warm the flat up but the boiler doesn't react. I have also set the timer on the boiler to ON.

Pictures of existing wiring for the old system, the nest and the boiler front panel.

Any help/checks welcomed before I freeze ! :/
 

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you have it wired up wrong the nest switches the heating between terminals 2 & 3, you are using 1 & 3
 
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