Dish washer and control method thereof

A controlling method of a dish washer comprising the steps of:

• performing a washing cycle or a rinsing cycle;
• monitoring whether a filtering device, through which water passes, is blocked due to sewage or not;
• repeating the washing cycle or the rinsing cycle until the filtering device is not blocked;
• and
• further performing the washing cycle or the rinsing cycle once again when the filtering device is not blocked until one of the washing cycle or the rinsing cycle is completed and finishing the repetition of the washing cycle or the rinsing cycle.

A controlling method of a dish washer comprising the steps of:

• pumping and jetting water toward dishes accommodated in a tub;
• filtering the water with a filtering device;
• and
• bypassing the water to be supplied to the filtering device through a bypass to the tub or a sump for accommodating the water when the filtering device is blocked.

A controlling method of a dish washer comprising the steps of:

• performing a washing cycle or a rinsing cycle at least twice;
• detecting water when a filtering device is blocked during respective cycles and outputting signals according to the pollution levels of the water;
• and
• comparing a combination of patterns of the signals outputted during the cycles performed twice with a predetermined pattern to determine the pollution level of the water.