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We just moved into a new house and I want to replace the thermostat. I am trying to figure out if my current setup has a C Wire.

If it doesn't, then I'll need to get a new wire run -- which I want to avoid.

If it helps, this is a White Rodgers 1F80-361 thermostat.

enter image description here

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  • it does not need C wire, it is battery operated,
    – knowitall
    Jun 22 at 19:43
  • I know it is. But I am replacing the thermostat and the one I am getting needs a C Wire. Jun 23 at 2:55
  • so that is the old thermostat ? it does not have the C connected to it.
    – knowitall
    Jun 23 at 3:16
  • I guess not? I'm not exactly sure. Jun 23 at 14:33

2 Answers 2

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Look at your furnace/HVAC unit's control board and see if there is a "C" terminal. If so, then see which wire, if any, it's connected to. That is your "C" wire at the thermostat.

If no "C" terminal that you will not have a "C" wire and could possibly hook one up if you have the wiring diagram for the furnace.

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Assuming you show the new thermostat not the old one.

That one doe not need C- wire. It is battery operated.

It also does not have the C-wire connected in that photo.

Sometimes you get lucky and the C wire is there, just not used (probably black or blue wire.

thermostat

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