I’m trying to replace my thermostat with the Honeywell Smart-WiFi thermostat. Quick summary, I have an extra yellow wire which I’m making the C wire, but its not connected at the other end and I’m not sure where it should go.
This picture is with the original connections to the previous thermostat. There is no C wire. Labels are:
W = white
Y = blue
G = green
R = red
yellow wire left over, not connected
Here’s the photo of the new thermostat wall plate. Labels are:
C = common
R = red
W = white
Y = blue
G = green
I’ve since removed the R to Rc jumper loop.
Of the 5-wires that lead from the thermostat, on the A/C end they connect as follows:
thermostat blue connected to small white to small green to thick brown w/ a "C" label on it.
thermostat red connects to thicker red wire w/ label "R"
thermostat white connects to thicker white wire w/ label "W"
thermostat green connects to thicker green wire w/ label "G"
yellow is left unconnected
Just a note, I'm getting the feeling the blue wire is actually common because it's connected to another incoming wire that is labeled "C", but on the thermostat end, it's labeled "Y". Should I maybe just pair the yellow to the same wire labeled "C" near the A/C end?
Any help much appreciated.