Wifi thermostat wiring.
I am trying to wire a newer thermostat requiring a "C" wire. I am having some trouble since There is more wires on the furnace transformer then coming out of the wall to the thermostat. I am assuming these go to the air conditioner outside.
Explanation of the wiring in the picture:
On the Y terminal there is a white and yellow wire. On the C terminal there is a red wire. These are separate and go somewhere besides the thermostat in a separate wire altogether.
The yellow (Y), blue (G), white (W), R (orange) all go to the thermostat.
I added that brown wire which was a spare to the top of C and connected to the thermostat at C and the thermostat didnt turn on.
How do I wire this all up?