When a microwave oven door suddenly refuses to close properly or latch shut, the mechanical failure is typically caused by warped plastic door frames, broken or misaligned torsion springs in the latch assembly, food buildup caked inside the latch holes, or loose hinge screws. When the door fails to seat flush against the frame, safety interlock switches cannot engage, preventing the microwave from starting. You can troubleshoot door alignment easily. You can verify that your corrective action is successful when cleaning away sticky food residue, tightening loose hinge screws, or replacing broken latch springs allows the door to close smoothly and click shut securely.
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