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Yep. Needed a wiring modification. I discovered that I needed to jumper the Aux Heat terminal to the Emergency Heat terminal since my emergency heat IS my 2nd stage.

Now, when I have a 3 (or 4,...

System (Heat Pump) = 1 cool/2heat (1 heat stage=heat pump, 1 heat stage=electric heating strips)
My old White-Rogers t-stat would automatically kick on the electric strips when the difference...

My TRANE 2TWR1024A "user manual" is worthless. I cannot figure out how many stages this thing has, or what actually determines "stages". It has supplemental electric heating strips for extra cold...