Honeywell warrants this product, excluding battery, to be free. Search for honeywell heat pump thermostat wiring diagram here and subscribe to this site honeywell heat pump thermostat wiring diagram read more! Unique Wiring Diagram for Honeywell thermostat Rth2300b The color of wire r is usually red and c is black. Honeywell heat pump thermostat wiring diagram . This is because it's a very basic thermostat designed only to control a heating system. Install the honeywell lyric thermostat like a pro. We are trying to connect a honeywell pro thd thermostat. If you check the honeywell thermostat ct31a1003 wiring diagram, you'll see that it requires only two wires. As shown in the diagram, you will need to power up the thermostat and the 24v ac power is connected to the r and c terminals. Variety of heat pump thermostat wiring diagram honeywell. Find support for your honeywell thermostat. These two connections will ensure that there is power to the thermostat ...