central heat pump heating and cooling energy all 0

edit

I have a model with VAV reheat air system with heat recovery chiller. I use the central heat pump component with geothermal loop. When I run the full year simulation, the simulation is completed but the heating and cooling energy are reported as 0 in the E+ result. Anyone has the same experience. Just look weird to me. It's OS v2.8.1.

The same model runs fine with conventional chiller and boiler. All I did was replace the chiller and boiler with the central heat pump system.