Connecting the blue common wire

[RonL]

• My nest thermostat is telling me that it is not receiving consistent power and needs a “c” wire. There is a spare blue wire at the thermostat and the furnace. However, there is already a wire connected to the “c” terminal at the furnace. Is it OK to connect the blue wire to the “c” terminal in addition to the one already connected?

[EdwardT]

Hi RonL,

Thanks for reaching out. I'd love to know more about this. Do you see the other end of the C wire tucked on your wall?

Thanks,

Edward

[EdwardT]

Hi RonL,

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do. 

Thanks,

Edward

[RonL]

Edward,

i have a blue wire tucked away at both ends (at the thermostat and at the control board at the furnace) for both thermostats. My concern is that there is already a wire connected to the ´c’ terminal from somewhere. My question is it safe to connect the blue wire to the ´c’ terminal when there is already a wire connected to it?

Ron

[EdwardT]

Hi RonL,

Thanks for the response. Connecting the blue wire to the terminal would work, but I would suggest that we check where the other end of the wire that is currently connected to the C terminal is connected to.

Thanks,

Edward

[MelbaDT]

Hey there, 

It's us again ― how's it going now with your thermostat? Have you managed to trace where the wire connected to the C terminal is going?

Best,

Melba

[MelbaDT]

Hi, 

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.

Best, 

Melba