I'm trying to install a nest 3 to zone 1 of the Taco board as a
replacement for a failed Honeywell programmable thermostat. The old
thermostat had just a red and white wire connected with the white to the
white terminal and the red to the Rh and a ju...
I solved this by finding another post titled something like C wire
hookup to taco box. In that thread it says you should hook your C wire
from the C terminal of the nest(Blue wire normally) to the COM
connection in the taco box. This is found in the ...