I recently replaced my old American Standard thermostat with Google Nest. Cooling works fine but Heat does not work and simply goes into an unending loop of 'delayed: will start in 2:30 secs'
Anyone has an idea what I am doing wrong? Thanks.
Update: updated the wiring diagram with a bigger picture. I bilieve i may have a heat pump outside the house. The outside installation looks like what google says is a heatpump. Also, zoomed out picture of furnace wiring: