... switch to sterilization condition, the machine start sterilize for 30 minutes, while the door is locked tightly ... door, choose yogurt making.( also you can make natto and rice wine).3. 3 options for you, light, ... After 4 hours continuous refrigeration, the machine will defrost for 10 minutes, after that, return back to refrigeration ... refrigerationPlease view our other produdcts: Yogurt Making Machinery