With the stat off, stat switch in the off position (heat/off/cool) I'm getting 24v from red to w/g/yAaron wrote: ↑Thu Dec 20, 2018 5:44 pmOk. One step at a time, please.
With the stat mounted on its plate, with the heat turned on and the associated "Heat On" indicated in the display, are you testing 24VAC between those white and red splices?
Wait until "Heat On" disappears from the display, and tell me if you still see 24VAC between those white and red splices.
With the stat on, switch in "heat" position, no call for heat, same as above.
Raise stat setting for more heat, red to w - nothing (assume because white is now energized), red to g/y = 24v