Microwave shows F9 and will not start; sometimes accompanied by a clicking sound from inside.

Critical safety: Door switch faults can allow unsafe operation. Unplug the microwave before any inspection. Do not bypass or tape switches.

User checks:

• Inspect door alignment: Open and close the door slowly. Ensure it closes evenly and fully, without needing extra force. Look for sagging or misalignment.
• Clean latch area: Wipe the door latch hooks and the corresponding slots in the cabinet with a dry cloth to remove food debris that may prevent full engagement.
• Listen for clicks: As you close the door, you should hear distinct clicks from the internal switches. If you do not hear them, or if the door feels loose, the latch or switches may be damaged.
• Try gentle upward support: While closing the door, gently lift on the handle to see if F9 clears temporarily. If it does, the hinges or latch alignment may be worn.

Service recommendation: Door switches and latch assemblies are safety-critical and located near high-voltage components. A technician should test each switch with a meter, adjust or replace the latch bracket, and verify proper interlock operation.