Replacing Honeywell that has numbered wiring

[Pmark]

 

I want to replace my Honeywell thermostat in my condo to a Nest, however the wiring is all numbered and doesn't have letters.  What is the numbers to letters conversion, also which Nest should I be getting to accommodate my wiring?

[Jenelyn_O]

Hi Pmark,

Thanks for posting in the Google Nest Community forum. I'm sorry for the delay. It looks like you have a proprietary system, which isn't compatible with Nest Thermostats. However, some proprietary systems can be rewired by a pro installer to be compatible.

Best,

Jenelyn