If the door of a microwave oven opens when there is no food inside and the microwave is not being used, it may be due to a couple of possible reasons:
Mechanical Issue: The latch mechanism or the door hinges could be worn out or damaged. Over time, the moving parts of the door can experience wear and tear, which may lead to issues with the door not latching or staying closed properly. This can result in the door opening unintentionally even when the microwave is not in use.
Misalignment or Adjustment: The door of a microwave oven relies on precise alignment and adjustment to ensure it closes securely. If the door or the latch mechanism becomes misaligned or improperly adjusted, it may not fully engage or lock in place, causing the door to open unexpectedly.
In either case, it is important to address the issue promptly to ensure the safe and proper functioning of the microwave. If you encounter this problem, it is recommended to contact the manufacturer or a qualified technician to inspect and repair the microwave. It is not advisable to use a microwave with a faulty door, as it can pose safety hazards such as the escape of microwaves or electrical malfunctions.