Nest states no power on c wire

[Geppetto]

Connected nest today for the first time. Will work without c wire connected (internal nest battery) but when c wire is connected states error e79 wire detected but no power. Multimeter shows 26v between c wire and any other wire. Suggestions on how to fix this? 

[zoeuvre]

Hi Geppetto, 

Thanks for reaching out to us, and I'm sorry to hear about the situation. Let's sort this out.  

A few questions: Who installed the Nest Learning Thermostat? Are all the wires firmly seated into the terminals including the C wire? Also, can you help me with your Nest Learning Thermostat's power reading? 
 

1. To open the Quick View menu, press the thermostat’s ring.
2. Choose Settings.
3. Turn the ring to highlight Technical Info then press the ring to select it.
4. Select Power.
   • Battery
   • VOC
   • VIN
   • IIN

I'll look forward to your response.

Best,

Zoe

[zoeuvre]

Hi there, 

I want to check and see if you are still in need of any help. Please let me know, as I would be happy to assist and answer any questions you may have.
 

Thanks,

Zoe

[zoeuvre]

Hello Geppetto, 

We haven't heard from you in a while, so we'll be locking this thread if there is no update within 24 hours. If you run into any more issues in the future, please feel free to create a new thread.
 

Regards,

Zoe