Hello MikeRitchie,
Thanks for reaching out here in the Google Nest Community Forum!
It sounds like you've got a specific wire (w/e) that you're trying to connect to your Nest thermostat. Typically, Nest thermostats use common wire labels like Rc, Rh, C, W, Y, G, and O/B. In your case, if the wire is labeled W/E, it might not be immediately clear where it should go.
To determine the correct placement, you might want to share with us a picture of your existing thermostat's wiring setup. Also, tell us the make and model of your HVAC system and what type it is.
I'll look forward to your response.
Regards,
Mark
