METHOD FOR CONTROL A DRAIN PUMP OF A DISH WASHER

PURPOSE: A method for automatically controlling drain of a dish washer is provided to automatically drain for anti-freezing by operating a drain valve when the temperature of cleaning water becomes under anti-freeze set temperature. CONSTITUTION: A method for automatically controlling drain of a dish washer is as follows. Dishes in a dish washer is cleaned and rinsed by supplying cleaning water, detergent, rinse water, and rinse(S115). After finishing clean and rinse, pollution level of the cleaning water in a cleaning water tank is measured depending on pollution level values which are measured from each pollution level sensor installed in the cleaning water tank(S119). If the pollution level of the cleaning water is over pre-set reference value, a cleaning water drain valve is automatically operated(S129). After being automatically drained, next cleaning standby state or power-off standby state is maintained.