Honeywell Thermostat Rth9585Wf Wiring Diagram. Test the 2 wire thermostat wiring by turning the furnace on. If you have a c wire, place it into the c terminal on your wall plate.
Reconnect the red and white wire, tighten down the set screw, and put the control panel back on. Label wires according to old thermostat terminal designations, not by wire color. This manual is available in the following languages: