To produce a business system in an increasingly competitive global market means constantly finding ways to improve the process. Maintenance, as an integral part of production processes, plays a significant role in achieving the final business result. The application of technical diagnostic systems within industrial production systems can be used in a positive way at the level of plant efficiency. This research shows the impact of the installation and application of a modern on-line diagnostic system on the final production results on the example of a technical system of paper machines. The analysis and calculation refer exclusively to the impact of the maintenance service on the overall efficiency of the plant by monitoring the number of hours in failure at the observed intervals before and after the installation of the diagnostic system. As it is a continuous production process with a larger volume of production based on hourly performance, even a relatively small % of the increase in efficiency brings a significant economic business result