Honeywell Thermostat Ct31A1003 Wiring Diagram. Web honeywell thermostat wiring can vary from model to model. Web if you check the honeywell thermostat ct31a1003 wiring diagram, you'll see that it requires only two wires because it's a very basic thermostat designed only to. Pictures Of Wiring Diagram For Honeywell Thermostat Rth221 5 2 Day from www.pinterest.com […]