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I recently installed a Learning Nest T stat and the Aux heat doesn't work

Community Member

System is a gas furnace with Heat pump.  This system has worked for years with a conventional T stat and outdoor t Stat.  The outdoor thermostat was set to 38 deg F.  the gas would run under 38, heat pump above 38.  I set up my Nest T stat following the instructions but the W2/Aux terminal never has voltage, even in test mode.  The old outdoor t stat is disconnected, I programmed the Nest to use W2/aux under 38 deg F.