It's important to note that microwaves are designed with safety mechanisms to prevent radiation leakage. However, it is generally recommended to close the door of the microwave before starting the countdown timer for a couple of reasons:
Safety: Closing the door before starting the microwave ensures that the microwave's safety features, such as the interlock switch, are engaged. These switches are designed to prevent the microwave from operating while the door is open. While most microwaves won't start the cooking process until the door is closed, it's still a good practice to close the door before setting the timer to ensure proper operation and safety.
User Experience: Closing the door before setting the countdown timer helps you avoid accidental starts. It reduces the risk of any inadvertent contact with the microwave's controls or exposure to microwave radiation during the initial setup.
While the microwave's safety mechanisms should prevent radiation leakage even if the door is open during the timer setup, it is always best to follow the recommended usage guidelines provided by the manufacturer. The specific instructions may vary depending on the make and model of your microwave, so consulting the user manual is advisable for accurate information regarding safe operation and proper use of your microwave oven.