This report contains a programming improvement work in a LabVIEW™ fire testing furnace control system for SP Fire Technology in Borås. Here materials and products behaviour are tested and evaluated, being exposed to fire. For this task, UGNET is being used for control and surveillance of the testing furnace system. System hardware has been updated gradually through the years, while the software has been neglected. The task consisted of gaining knowledge of LabVIEW™ and the control system in whole. A further necessary measure is needed concerning program interface and localisation and elimination of useless code and program errors. Documentation from the work is presented in this report. The project group have approach these problems by analyzing code structure, searching and eliminating errors within the program and creating useful functions. All the updates has carefully been tested and checked during live furnace tests in the laboratory. Improvements have been made continuously in consultation with furnace operators and support from Benima. The work has resulted in a modern and well functioning UGNET program interface, eliminated useless code and a number of new useful program functions.