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Troubleshooting thermostat install

madmandad
Community Member

I am trying to install a Nest Thermostat in my new place. Replacing a Honeywell thermostat. Ran it through the compatibility checker, and everything appeared to be good, but worried now. Old system has:

Y: yellow wire

G: green wire

C: blue wire

O/B: orange wire

W2 (with AUX to the left of the main label) white wire

R: red wire

System worked fine before, but after Nest install, no heat. I am worried that the W2 setup means I need a learning thermostat to make this work. Looking to see if that will fix my problem. 
thank you. 

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