An air conditioner maintenance system (1), wherein: a maintenance server (50) comprises a storage unit (502) in which control data specific to a model of an air conditioner (10) is stored, and a communication unit (503) that transfers the control data to a portable information terminal (40); the portable information terminal (40) comprises a communication unit (403) that downloads the control data from the maintenance server (50), and a transmission unit (404) that sends the control data to an indoor unit (20); the indoor unit (20) comprises a reception unit (204) that receives the control data from the portable information terminal (40), and a communication unit (205) that sends the control data to an outdoor unit (30); the outdoor unit (30) comprises a second storage unit (303) in which the control data is written, a communication unit (304) that receives the control data from the indoor unit (20), and a rewrite unit (305) that rewrites the content of the second storage unit (303) with the content of the control data received by the communication unit (304).
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