Microwave does not start at all when pressing Start; display and clock work normally.

Safety: Unplug the microwave before inspecting door components.

Steps:

• 1. Door check: Open and close the door firmly. Ensure it latches with a solid click and the door icon (if present) disappears from the display.
• 2. Try different programs: Set a simple time cook (e.g., 30 seconds) and press Start. If nothing happens, but the timer counts down, the control relay or door sensing may be faulty.
• 3. Listen for relay click: When pressing Start, listen closely for a faint click from inside. No click suggests a control board issue; a click with no operation suggests a high-voltage or interlock problem.

Advanced:

• Remove the outer cover and test the door interlock switches with a multimeter for correct operation.
• Inspect the control PCB for a burnt or stuck relay controlling the high-voltage transformer.

Note: Because door interlocks are a primary safety system, repairs should be done carefully and tested thoroughly.