Performance degradation diagnosis system for refrigeration cycle apparatus

A performance degradation diagnosis system for a refrigeration cycle apparatus that includes a refrigerant circuit including a compressor, a heat-source-side heat exchanger, and a use-side heat exchanger, the performance degradation diagnosis system comprising:

• a computer including a first determining unit configured to determine, based on an index indicating an operation state of the refrigeration cycle apparatus, performance degradation of the refrigeration cycle apparatus with respect to each of a plurality of performance degradation factors of the refrigeration cycle apparatus;
• and
• a control unit configured,
• before the first determining unit determines performance degradation of the refrigeration cycle apparatus with respect to each of the performance degradation factors, to obtain an operation condition of the refrigeration cycle apparatus which is operating, and
• in a case in which the operation condition of the refrigeration cycle apparatus is not suitable to determine performance degradation of the refrigeration cycle apparatus with respect to a performance degradation factor of a determination target, to control the operation condition of the refrigeration cycle apparatus so that the operation condition of the refrigeration cycle apparatus becomes suitable to determine performance degradation of the refrigeration cycle apparatus.