C wire doesn't work

[syeaziran]

Hi, I was trying to install the google nest thermostat. I have 5 wires behind my old thermostat with a blue one wasn’t connected to the old thermostat. I assume that one is the C wire and I installed my nest thermostat, but it gives me error and the batteries ran out fast. Does that mean the blue wire is not C wire or it’s broke?How to fix it?

[Jenelyn_O]

Hi syeaziran,

Thanks for reaching out. I'd like to take a closer look at it. A few questions: what type of Nest Thermostat do you have? In what country are you located? Do you see any codes aside with the message that your thermostat is running out of battery? Please take a photo of the wires connected to your system's control board, and on how you wired your Nest Thermostat. Ensure that the labels of the wires are visible. 

Best,

Jenelyn