Can't identify C terminal.

[Luanvu]

So i was trying to install the nest power connector to solve the low battery issue on thermastat. There were 3 C terminals on the hvac board and i couldn’t figure out which one to connect c wire to. I am not an expert so i did capture the label of the control board 1068-310 1142 62-23599-03. 

[Jenelyn_O]

Hi Luanvu,

Thanks for reaching out. A few questions: what type of Nest Thermostat do you have? In what country are you located? What is the make and model of your system? For more complex systems and for pro instructions, use this Pro Installation Guide.

Let me know how it goes.

Best,

Jenelyn