Nest 3rd gen + programmer advice

22 Mar 2021
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United Kingdom
Looking to get a pro to install my Nest 3rd gen but I like to get a general understanding of the install. System is WB boiler on S plan and HW storage cylinder
I would like to use existing wall stat wiring to power the 12v thermostat from Heatlink T1 T2 in tank cupboard. I've got a reasonable understanding of the wiring configuration but not sure what happens with the programmer located with the boiler.
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Programmer in the boiler will need to be bypassed or, if that's not possible, set to be permanently on

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