Performed QA on Trane Heat Pump/Air Handler system. Found the Supply temperature sensor was not installed. Installed sensor and connected to the board. Checked connections on all of the plugs and sensors for the system. Programmed system and put into operation and tested. Tested system in Cooling Mode, Heating Mode, and Emergency Heat. Tested the ez trap safety and filled condensation pump. Refrigerant readings were all normal and system was operating. No other issues were found at this time. Completed checklist form in system and reviewed installation with homeowner.