T-Stat says it’s not compatible

[EricaA]

Nest is saying it is not compatible with our York TM9T furnace but it’s less than 6 years old so it seems like it should be. Any ideas?

[Derickf]

Hi @EricaA,  

Thank you for posting in the community! Ill be more than glad to help you with your compatibility questions: 

Could you please reply to this Thread with pictures of the current wiring on your furnace?

In the meantime you can take a look at the following article: Identify a thermostat wire

I'll be looking for your reply,

Best regards,

Derick.