Arrived to remedy a system that is unable to heat the home. Upon inspection of the system set it for a call for heat. Went downstairs and felt the outside unit attempt to start up and run. Went outside and checked the heat pump. Found that the refrigerant pressures would just skyrocket. Checked operation of the heat pump outside and determined that the reversing valve is not going to the proper position. Will call and order parts and schedule a time for installation.