I could not install my Nest correctly. After installing I turned on the heat but the system activated the AC instead. I restored my original thermostat and everything worked fine. So I think I incorrectly configured the wires or a setting on the device. Please help.
My old thermostat, a Robert Shaw digital, has six wires. A blue wire which goes to C. A red wire which goes to R. A yellow wire which goes to Y1. A white wire which goes to E/W1. A green wire which goes to G. And a brown wire that goes to B.
When installing the Nest, I put the blue C wire in C, the red R wire in R, and the green G wire in G. I also put the yellow Y1 wire in Y, the white E/W1 wire in W, and the brown B wire in OB.
I then got a message that it did not recognize the wires in W or OB. The wires appeared fully inserted with the tab depressed.
When I turned on heat only the AC worked. With some cooling around I turned on cool and got the heat to work but I’m not sure how I did that and could not replicate it no matter what wires or settings I changed.
I can confirm my system works properly because when I reinstalled my old thermostat with the same wire configuration it worked just fine.
I do not have a heat pump. I do have a dual fuel system. My heat comes from an oil powered boiler that provides steam heat to radiators. My cooling comes from an electric powered AC unit.
I can provide pictures or additional information as needed. Please help. Thank you.
