Nest thermostat 4th gen installation error E448 - No power on RC or RH

[ankoraggarwal]

 Hello,

Looking for advise on wring issue. I have a Honeywell thermostat working perfectly fine that i want to upgrade to Nest 4th Gen Thermostat. I used the same wiring as for Honeywell:

Honeywell - Nest Thermostat

Y - Y1

G - G

C - C

W - W1

RC - RC or RH

I get Error448 stating no power on RC, same error when i use RH instead. spoke with Google chat assistant. Also tried with charging nest thermostat panel for 8 hours. nothing could solve the issue yet. i have attached link for photos of Honeywell and Nest wiring for reference. Looking for suggestions.

https://drive.google.com/file/d/1WI27kHkXrHo2Tm4LIZTW0V7Y-l8-RM2N/view?usp=drive_link

https://drive.google.com/file/d/1ei7h561iJTx7zNW2S3dTZwVC4drGfI80/view?usp=drive_link

https://drive.google.com/file/d/1jprl5b5J2WX4MBMkiOrCTEn7adpvS8r7/view?usp=drive_link

Best,

Ankor

[Patrick_Caezza]

@ankoraggarwal 

Your Google Drive links are locked.

Do you see the camera icon?

[ankoraggarwal]

@Patrick_Caezza : here you go. thanks for you response.

[Patrick_Caezza]

@ankoraggarwal 

Are there two separate cables going to the thermostat?

Take a look in the furnace/air handler and verify how the cables are terminated there. Post a picture.

[ankoraggarwal]

@Patrick_Caezza Hello Patrick, here are the photos. i am not well versed with wirings. I got all the photos i found on the furnace/air handler. thanks your help. 🙂