Is thermostat blue wire needed?
I'm replacing a old thermostat with a new digital Honeywell one. On the old one both the Yellow and Blue wires are connected to the Y screw. I also have a green, red, and white. The new ones instructions say do not use wires marked B. This one is not marked B but I figure it refers to the blue wire. Should I just not hook up or put the two together like on the old one? I would rather not just hook up and see what way works because I rent and Landlord would be very unhappy with me if I broke anything.
Thanks for any help