Returned to install high pressure switch. Once installed, cycled system. Tested system in cooling mode to ensure refrigerant pressures are in range. Refrigerant pressures are good and system is producing a proper temperature split. Cycled system for heat. System kicks on but refrigerant levels are not where they are supposed to be and the system kicks off after running a couple minutes. Txv is creating a restriction in heat mode and not allowing system to properly heat. Need to return once valve and filter drier come in. Will need a helper. Cycled system, system is operational only in cooling upon departure. Collected $848 today, $1720 will be due upon completion.