The use of split-type air conditioners (STAC) is very popular in residential and commercial buildings and demand for these types of air conditioners is increasing year by year. Theoretical and practical case studies for fault detection and diagnosis of STAG constitute a vital part in technical services and refrigeration/air-conditioning laboratories of mechanical engineering. Fast detection of fault is quite important for technical services. In this study, a fault-test prototype of split-type air conditioner has been designed and implemented. In order to perform the performance analysis, sixteen different faults have been created on the control unit of this prototype. The behavior of the system has been also investigated under the normal and faulty conditions. The test results for faults are presented and compared with the normal operating results. In addition, solutions offered against the faults have been also provided for the participants.