nest learning thermostat

[whit]

i have a heat pump and i have two wires that do not correspond with the hookups on the nest.  i have an S1 pink wire and and aux white wire.  when I did a compatibility it showed those wires but they are not on the wire hookups on the nest itself.  what do I use or how do I hook up?

[zoeuvre]

Hi whit, 

Thanks for posting here in the community forum and for showing interest in our Nest thermostats. Are you located in North America or Europe? And could you send us a photo of the wiring configuration of your current thermostat so I can take a closer look? Also, you may use our Compatibility Checker to determine if a Nest thermostat is compatible with your heating and cooling system.

Keep us posted. 

Best,

Zoe