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Worcester Greenstar 30CDi Combi boiler with Nest

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Hi,

I've been having trouble trying to install a Nest Thermostat (3rd Gen) to my Worcester Greenstar 30CDi combi boiler.
I can't even get the heat link unit to power when wired from the boiler's output power.

Does anyone know where I'm going wrong?

Any help or advice would be appreciated.
please visit..... to see a diagram.......... (this is a link)
> ibb.co/mNH4oH

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