EWC-ST-3C and Nest

[pcoppole]

I just moved to my new home and i have a EWC-ST-3C control panel and I would like to change the current zone 1 thermostat to a NEST 3D
But i'm having a problem with the connectivity. Nest technical support said to connect the wire the following way:

Current Ultra zone thermostat Nest
G-----------------------> G
O-----------------------> O/B
Y------------------------> Y1
W------------------------> W2AUX
B------------------------> C
R------------------------> RH

Any suggestions?

Thank you / pat

[Paul Z.]

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