Hi. I'm hoping one of the HVAC experts can help. I've got a gas furnace and today I bought a new thermostat after the old one seemed to go bad. It is digital and had show low batteries. When I replaced it with new batteries, the display was blank.
So when I bought the new thermostat (low voltage manual type) I've tried to replace the wires by color to the appropriate W, B, G, and R places. There is no R screw, only the RH and RC. I think it was a mistake to put the b on the b screw. The little booklet shows the b screw empty.