3rd Gen Nest Learning Thermostat Compatibility

[souk3650]

Looking to confirm compatibility and wiring for 3rd Gen Nest Learning Thermostat. We have a heat pump with electric auxiliary back up heat. Unsure how to add a photo to this message (doesn't appear to have an option). Our current thermostat is a Honeywell Home ProSeries with the following wires being utilized: Y (yellow wire), G (green wire), C (blue wire), O/B (brown wire), W2/AUX (white wire) and R (red wire).  Any help is greatly appreciated! 

[CoolingWizard · Accepted solution]

@souk3650 ,

The Nest Learning Thermostat is fully compatible with your system. 

AC Cooling Wizard 

[Paragann]

I have the same system and followed the instructions for setting up my Nest 3rd Learning Thermostat and the AC doesn’t come on warm air comes out the vents

[souk3650]

Did you put the red to RC or RH on the nest? I’m concerned about the electric auxiliary heat working this winter. 

[CoolingWizard]

@Paragann ,

apparently, your heat pump is what we know is a B model and not an O model. You need to go into settings and then equipment then go to the heat pump, and change the checkmark from O to B and your heating and cooling will work properly  

AC Cooling Wizard.