“Want to replace RTH230B with RTH9580WiFi. Wires connected:G, Y, W has(black wire), R(red wire), Rh(red wire). Also I see a white wire that is not connected to current rth230. How do I know which wire is used for the "c" terminal for the new rth9580WiFi?”

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• Since they're not labeled at the thermostat terminal, you'll need to check at your furnace to see what's connected where. Having the extra wire is great, since you should be able to use that for your common.

  Answered by Jturn 7 years ago

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• Hi JoeP! The C-wire is going to be separate from the wires you have listed above, I suggest taking a peak at your system and confirm that you have a C terminal to connect to, once locating I suggest preforming the G-wire solution, I have listed a link below with instructions. Hope this helps! https://www.youtube.com/watch?v=jniws7wqeY4

  Answered by Honeywell Support 7 years ago

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