Found disconnect low voltage wire for ecm blower motor. I hooked it back up; found no other mechanical issues with the system. I checked the zoning, refrigerant pressures, blower motor, compressor and condenser fan motor and strip heat. I did find black biological growth inside the air handler; UV light is recommended to treat the black growth. I also recommend updating flood protection system for the hvac system and a homecare maintenance program. The homeowner declined all estimates at the time of service call.