Still have not managed resolved fitting my thermostat. Not sure where to connect the three wires. I have a red, blue and yellow wires on may old thermostat. But not sure which wire connects to which block on thermostat.
Apologies for the delayed reply. I wanted to follow up and ensure you are good to go. If you are unsure on what your wire labels are, I would recommend checking the system control board. It would have more details on what the wire exactly controls.
You can also have a Nest Pro come out and take a closer look. They would be able to install the device and ensure everything is working properly. Please let me know if you have any questions.