Tried installing the Wyze thermostat today and had to stop due to the wiring at the heating air-conditioning system. I’m coming from a Nest Gen 1 and only have Rh, G, Y1, and W1 wires connected at the thermostat. I didn’t know that I needed to use the C adapter before purchase. This should be clear on the product webpage. In either case, here’s the problem. At the HVAC system, there’s a black wire connected to the C terminal and the Y terminal has a yellow and red wire connected. How do I wire this up correctly?
Note, the G and W terminals only have one wire as expected. Lastly, I have a blue wire not connected at the thermostat and the C terminal at the control board. Can I just connect the blue wire on the control board which also has a black wire connected and then connect the blue wire to the thermostat?