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Long story short, tried installing smart thermostat Ecobee3 - didn't work. One of the potential culprits is the fact that for some reason the G and Y wires are tied together when they exit the unit (photo attached). R and W and C are all separate, however C doesn't make it to the thermostat. All these wires are tied to thicker wires (original thermostat must've been line voltage), which then somewhere in the wall/ceiling are then tied to small wires that come to the current thermostat.
So, three questions:
- Why would G and Y be tied together?
- Could the C wire be used anywhere in the system? It's not making it to the thermostat now.
- Is there a way to install the smart thermostat without a complete rewire of the system? The thermostat would need at least R, W, G, Y (and then there's a way to use the "Power Extender Kit" to tie the C into them).
Thank you very much in advance!