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Gas heat, we try to use white in the thermostat wires to bring the gas heat in green wire, fan, red is 24 volt hot, blue is common ,yellow cool , This is how I wire my thermostat is simply pull the cover off see what wires they got going to which des...

Did you try the w1 connection yet 

What you have is a tech that used uncommon wiring colors due to what was in the wall, looks like a heat pump, w1/w2 are your auxiliary and possibly emergency on w2 or second stage auxiliary, that brand of t-stat is known for advertising it does aux h...

Depends on which nest you have, although I’ve never wired this brand without a common wire on the t-stat I’ve read where it’s the basic model that needs the c-wire. If your nest has a rc terminal then u can eliminate the common and your good 

That’s not much info to go from