Google Nest Community

My fan works when turned on manually with the Nest but is not automatically turning on when heating or cooling, which is necessary to blow hot or cold air on my forced hot/cold air system. I have a gas furnace and central air.My wiring setup is G W Y...

My Nest doesn't automatically turn on the fan when heating and cooling. However, if I swap the W and G wires it will work properly and turn the fan on automatically when heating and cooling. A Google Nest tech told me I cannot leave the wires this wa...