Leaving the microwave door open while the microwave is in operation can be extremely dangerous and should never be done. Microwaves are designed with safety interlocks that prevent the oven from generating microwaves when the door is open. This is to protect users from harmful microwave radiation.
If you were to operate the microwave with the door open or if the door doesn't close properly, the following could happen:
Exposure to microwave radiation: Microwaves emit non-ionizing radiation, which can be harmful to human tissue and organs if directly exposed to high levels. Standing too close to an operating microwave or leaving the door open could lead to radiation exposure.
Fire hazard: If the microwave operates with the door open, it can lead to arcing (electrical sparks) inside the microwave cavity. This can cause damage to the microwave and even lead to a fire if flammable materials are nearby.
Damage to the microwave: Operating a microwave with the door open or with a faulty door can damage the microwave's internal components, such as the magnetron (microwave generator), the waveguide, and the control circuitry.
Always ensure that the microwave door is properly closed and that the safety interlocks are functioning correctly before operating the microwave. If you notice any issues with the door or suspect a problem with your microwave, it's essential to have it checked and repaired by a qualified technician to ensure safe and proper operation.