Patent ID: 8387189

Claim:
A controlling method of a washing machine including a steam supply unit to evaporate water and supply steam into a drum and a washing heater mounted to a tub to heat washing water in the tub, the controlling method comprising: supplying washing water with detergent into the tub, wherein the supplied washing water is lower than a predetermined water level; performing a high concentration washing process by rotating a drum; supplying steam into the drum to increase an inner temperature of the drum by operating a heating part of the steam supply unit and without directly heating the washing water; supplying washing water without detergent until the washing water reaches the predetermined water level after the high concentration washing process and the supplying steam; performing a dilution washing process by rotating the drum; operating the washing heater when the washing water reaches the predetermined water level to increase a temperature of the washing water without operating the heating part of the steam supply unit and directly heating the wash water; and rinsing the laundry after the dilution washing process; and spin-drying the laundry.