<p>Malfunctions in the control and steam distribution systems of steam turbines lead to reduced accuracy and stability in maintaining the controlled parameters of power units, and may result in sudden load changes or turbine trips. To monitor the condition of turbine control and steam distribution systems, the Technical Operation Rules for Power Plants and Networks of the Russian Federation require periodic inspections and testing. However, long intervals between inspections and the subjective nature of data interpretation often impede early detection of incipient defects, making it difficult to timely identify and eliminate their causes. The implementation of electrohydraulic control systems (EHCS) based on modern microprocessor technology makes it possible to automate these inspections and tests and improve their consistency and objectivity. Additionally, EHCS enable the use of additonal diagnostic algorithms for the control and steam distribution systems of steam turbines.</p>