thank you for your post. I had exactly the same issue today while installing Ecobee3. One problem I’m experiencing however is that fan does not turn on when heating pump in spinning. If I manually turn on the fan it is working fine and warm air comes out, for a while and then just room temperature/coolish air comes out.
My configuration is:
Heat Pump Type: Air to Air
O/B Reversing Valve: O/B Energized on Heat
Aux Heat Simultaneous Operation: Enabled
Furnace: Fan Control in Heat Mode: HVAC