Abstract: A fault recognition in a hearing aid of a user includes providing an actual image of a component of the hearing aid and comparing the actual image with reference images. An analysis unit carries out an image comparison, in which the actual image is compared to one or a plurality of reference images, which each show the component in a state, of which it is previously known whether the component is faulty or faultless. The analysis unit determines as a state of the component of the actual image that state which is assigned to the reference image which is most similar to the actual image. This recognizes whether the component is faulty or faultless. A system has an analysis unit that is configured to carry out the method.

Abstract: A method is shown which recognizes whether a hearing device system or a hearing device component is fitted correctly in an ear. To this end an acoustic test signal is output by an output device and is received again by a recording device. The test signal received back is compared to the permanently preset reference values of reference criteria in order thereby to obtain a status signal. The status signal contains information about the fit. In other words, it is possible to establish by the status signal whether the hearing device system is correctly fitted. Furthermore a hearing device system is shown which is suitable for performing the method.