Adding c-wire

[JasonM1]

I'm trying to connect my Nest thermostat. I bought it because it doesn't need a C-wire. The Nest Power Connector is basically the same thing.  I rent an apartment and they don't allow c-wire installation. Probably because the wiring on the board at the HVAC unit is connected to R, G, W, and C, but not to Y.

Do I have any options besides returning this?

[Patrick_Caezza]

@JasonM1 

That wiring doesn't make sense.

Can you post a picture of the original thermostat and the HVAC control board wiring here.

[JasonM1]

I am trying to figure out how to post images here.

[JasonM1]

 

[JasonM1]

 

[JasonM1]

There is an unused blue wire at the thermostat, but it has been cut somewhere along the way.

[jenniffert]

Hi JasonM1,

Thank you for posting in the community! I'm happy to assist you with your Nest thermostat compatibility concerns regarding the common wire.

@Ashepherdson, Thanks for your input. I also appreciate all the information you've provided, @JasonM1. Based on the pictures, it seems you have a common wire installed on the control board, which is the yellow wire. To provide the most accurate guidance, please confirm the following:

• Do you have a heating-only or heating and cooling system?
• Could you please share the make and model of your HVAC system?

Please keep me posted. 

Best regards,

Jenniffer

[JasonM1]

It's heating and cooling. The yellow wire on the C terminal is not the same yellow wire as the one at the thermostat. 

I had a friend stop by and get it working. Thank you for the response. 

[JasonM1]

I had a friend stop by and get it working. Thank you for the response. 

[jenniffert]

Hi @JasonM1,

Thanks for following up! 

I'm glad to hear that the inconvenience was resolved. I also appreciate all the efforts you've been making to resolve this inconvenience.

If you need more assistance in the future, feel free to post again.

Best regards,

Jenniffer