lint filter 52 generally the blower unit 60 includes a blower 62 and a blower housing 64 and the blower 62 is connected to and driven by the motor 70 for driving the drum 20 an opening 42 generally having a number of through holes is formed on the rear supporter 40 the opening 42 is connected to the hot air supply duct 44 the hot air supply duct 44 communicates with the drum 20 to serve as a passage for supplying hot air to the drum 20 accordingly the hot air heater 90 is installed at a specific position of the hot air supply duct 44 meanwhile the steam generator 200 is installed at a specific position of the cabinet 10 to generate steam and supply the steam into the drum 20 the steam generator 200 is described in detail below with reference to fig3 the steam generator 200 includes a water tank 210 for accommodating water therein a heater 240 mounted in the water tank 210 a water level sensor 260 which measures a water level of the steam generator 200 and a temperature sensor 270 which measures a temperature of the steam generator 200 the water level sensor 260 includes a common electrode 262 a low water level electrode 264 and a high water level electrode 266 the water level sensor 260 detects a high water level and a low water level according to whether the common electrode 262 is electrically connected to the high water level electrode 266 or whether the common electrode is.