connect the water supply, preheat the water tank after it is filled with water. When the water in the water tank boils to generate steam, turn off the power knife and slowly open the door to let the high-temperature steam in the rice steamer relieve pressure, then open the door to put the food to be steamed, close and lock the door, and continue to power on and heat. Drain the remaining water in the water tank after each steamed meal and remove the scale twice a week to prevent the scale from accumulating on the ball valve and the fever tube, causing the ball valve to block and the fever tube to dry up.