Nest Snow W1 and W2 wires

[brodiew]

Old thermostat used wires O, R, Y, E/W1, W2, G, C

Nest has connectors for Y,C,W,G,R, OB

The only one I am having issues with is the "W" connection on the Nest.  

Do I connect the E/W1 wire, or do I connect the W2 wire?   Or 3rd option.... Is this thermostat even compatible?  I have swapped out thermostats a few times over the 11 years I have been here, and this is the first time I have run into this issue. 

[sporfrog]

It looks like the "Nest Thermostat" may not compatible with your system. That thermostat will support HVAC systems that use up to 6 wires.  Your system is using 7. The Nest Learning Thermostat likely will work,

Check the Compatibility Checker to be sure.