Patent ID: 8209805

Claim:
A controlling method of a laundry machine comprising: turning on a steam heater of a steam generator configured to generate and supply steam to a tub or a drum when a water level sensor senses a predetermined water level of the steam generator, wherein the water level sensor includes electrodes to sense water level of the steam generator; sensing a malfunction of the water level sensor of the steam generator; and turning off the steam generator when the malfunction of the water level sensor is sensed wherein the malfunction of the water level sensor of the steam generator is sensed: when the water level sensor senses at least two water levels at substantially the same time; or when a temperature of the steam generator rises higher than a preset temperature within a preset time period after a full water level is sensed by the water level sensor and a steam heater of the steam generator is turned on; or when the water level sensor failed to sense a full water level within a preset time period after a water supply to the steam generator has started.