Single system no heat main floor. Found system to have open pressure switch error. Cleared tubing and system started. Upon inspecting system found weak run capacitor, very dirty blower, high gas pressures causing high temp rise making system shut down on high limit. Also found system lacked drain line flood protection. Adjusted gas pressures to within manufacture specification, cleaned blower, replaced capacitor, and added ss2 drain line switch into evap coil. Tested all components system running as designed at this time. Spoke about maintenance plan. Quoted maintenance as well.