error message on Nest 298

[egallacher]

My old thermostat uses 3 wires red, green, white  I have a spare black wire.

[Patrick_Caezza]

Duplicate post

[MelbaDT]

Hey folks, 

egallacher, just as Patrick mentioned, this seems to be a duplicate post which was already answered. Let's continue on that original thread instead as I will be closing this after 24 hours. 

Best, 

Melba