Nest Compatibility

[MSU600]

My current thermostat has G,Y,W,R and RC and no C.  I can add C without any problem.  Question is, where do I put the RC from the old thermostat?  Nest doesn't display RC as an option.  Can I make this work by using the O/B?

[zoeuvre]

Hi MSU600, 

Thanks for posting here in the Community forum and for showing interest in our Nest Thermostats. To help us get a better picture of your thermostat wiring configuration, do you mind sharing a photo?

On the other hand, you may use our Compatibility Checker tool will help you determine if a Nest Thermostat is compatible with your heating and cooling system.

I'll look forward to your response. 

Best,

Zoe