I tried replacing my honeywell TH2110D1009 with a Nest Learning yesterday however I noticed that the heat on my gas based Trane A/C unit is not turning on. Just cold air was blowing through the night despite the nest being on Heat mode and temperature set to 74°. I had to revert to the old honeywell. Can you help with the proper wiring? I'm attaching a picture of the honeywell setup.
Wiring to the nest was done as follows