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Knowledge about the relation between faults and the observed symptoms is necessary for fault isolation. Such a relation canbe expressed in various forms, including binary diagnostic matrices or information systems. The paper presents the use offuzzy logic for diagnostic reasoning. This method enables us to take into account various kinds of uncertainties connectedwith diagnostic reasoning, including the uncertainty of the faults-symptoms relation. The presented methods allow us todetermine the fault certainty factor as well as certainty factors of the normal and unknown process states. The unknownprocess state factor groups all the states with unknown and multiple faults with the states with improper residual values,while the normal state factor indicates similarity between the observed state and the pattern fault-free state.