Nest thremostat wiring confusion

[Lennylenz]

On my old thermostat the wires in order are 

rh is jumper wired to tv, red wire is connected rc

white wire connected to Y1

green wire to G

blue wire to O

i went through the install setup and it says to plug the blue wire to *OB 

my ac isn’t working now.

[ByronP]

Hi Lennylenz,

Thank you for posting. I'm sorry that your AC doesn't work. Help's here.

For your concern, can you please provide what type of Nest thermostat you purchased?

Can you send a picture of when the wires were connected to your old thermostat?

There is a good article you can review to identify a thermostat wire and check the wires you have. Usually the blue wire is connected to "C.". Also, there is a compatibility checker you can use to verify if your heating and cooling systems are compatible with the Nest thermostat.

Please keep me posted.

Regards,

Byron