Nest thermostat-1.4 power question

[miklosdavid]

Hello,

Nest thermostat. Wiring error message N261 Connected wires C-W-R

Power info: Vin: 26.235V

lin: 39

ps: C-39

Multimeter readings at the cables:

R-W: 26.4V

R-C: 26.4V

C-W:0V

what is the issue with the error? How I can fix it?

Thanks

[TVC]

I'm dealing with the exact same thing. Extremely frustrating. 

[miklosdavid · Accepted solution]

I solved the problem, I have an older TACO zone controller, with two wires only (TT).

I used the following link info to correctly cable my nest

https://www.doityourself.com/forum/thermostatic-controls/612022-taco-zvc404-locating-c-question.html  

[MelbaDT]

Hey folks, 

Thanks for keeping us in the loop on what you've done to resolve your concern, miklosdavid. This is greatly appreciated as it would be very helpful to other users who may encounter the same circumstance in the future. 

TVC, have you had the chance to try what miklosdavid did? 

Best, 

Melba

[MelbaDT]

Hey TVC, 

Checking back in — how's your Nest thermostat now?

Best, 

Melba

[MelbaDT]

Hi, 

I haven't heard from you in a while so I'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