Emerson Sensi 1F87U-42WF - What if I Don’t Have a Common Wire and Need One?

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What if I don’t have a common wire and need one?
There are a few options if the application does not have or will not allow the
pulling of a common wire (c-wire) through the wall.
1. Look for an unused wire in the thermostat cable bundle
– Video: Using an extra, unused wire as a common wire
2. Use the “G” (Fan wire)
– Video: Using a g-wire (fan wire) as a common wire
3. Install an Emerson Thermostat Common Wire Kit
– Video: Using an Emerson Thermostat Common Wire Kit