Opening and closing the door of a microwave oven while it is actively cooking, even if you don't press any buttons, can have several potential consequences:
Radiation leakage: Microwave ovens are designed with safety interlocks to prevent them from operating when the door is open. However, frequently opening and closing the door during cooking can wear down these safety features, potentially leading to radiation leakage. Microwave radiation can be harmful if it escapes from the oven and can cause burns or other health issues.
Uneven cooking: Every time you open the microwave door, the cooking process is interrupted. Microwave ovens work by emitting electromagnetic waves that excite water molecules in the food, generating heat. When you open the door, the microwaves stop interacting with the food, causing uneven cooking as the heat distribution becomes inconsistent.
Longer cooking time: Opening the microwave door repeatedly during the cooking cycle will extend the overall cooking time. Each time the cooking process is interrupted, the oven will need additional time to re-establish the required heat levels to continue cooking the food.
Potential damage to the oven: Excessive opening and closing of the microwave door can wear out the hinges and latches over time. This may result in improper sealing of the door, leading to reduced efficiency and potential safety issues.
Decreased appliance lifespan: Constantly interrupting the cooking process and stressing the oven's components may lead to accelerated wear and tear, shortening the overall lifespan of the microwave.
To ensure safe and efficient use of a microwave oven, it's best to avoid opening the door while cooking, unless necessary (e.g., checking on food, stirring, or turning it). If you need to interrupt the cooking cycle, it's better to stop the microwave, perform the necessary action, and then resume cooking from the beginning to ensure even cooking and safety.