Abstract: Detected temperature TMs of warm water thermistor 28a, presence of any or no wire break in nozzle unit 12, attachment completion data by attachment state sensor 17, continuous in-use data by timer 16 and data related to other cleansing function parts and units are read (step S52). If there any abnormal temperatures and wire breaks, these data and other detection data in various conditions are stored in backup RAM while unnecessary data (data at tests in production processes) which are considered as not contributing to investigation of causes of troubles are reset according to function part data, such as attachment completion data and continuous in-use data (step S62). This modification eliminates utilization of data obtained at tests in production process, not during continuous use, as data for investigation into causes when trouble occurs and thus enhances reliability of data.