Abstract: Various systems and methods are provided that detect faults in data-based systems utilizing techniques that stem from the field of spectral analysis and artificial intelligence. For example, a data-based system can include one or more sensors associated with a subsystem that measure time-series data. A set of indicator functions can be established that define anomalous behavior within a subsystem. The systems and methods disclosed herein can, for each sensor, analyze the time-series data measured by the respective sensor in conjunction with one or more indicator functions to identify anomalous behavior associated with the respective sensor of the subsystem. A spectral analysis can then be performed on the analysis to generate spectral responses. Clustering techniques can be used to bin the spectral response values and the binned values can be compared with fault signatures to identify faults. Identified faults can then be displayed in a user interface.