Samsung Won't Start – Control or Door Interlock Issue

Microwave display is on but pressing Start does nothing; timer does not count down.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Faulty door switch, Misaligned door latch, Defective Start button on keypad, Failed relay on main PCB

How to Fix / Troubleshooting

Safety: Unplug the microwave before any mechanical inspection.

  • Door check: Open and close the door firmly. Ensure it latches securely and that you hear distinct clicks.
  • Keypad test: Try other buttons (e.g., number keys, Stop/Clear). If some keys do not respond, the keypad may be failing.
  • Child lock: Verify that the child lock is not engaged (often indicated by a lock icon). Disable it per the user manual.
  • Professional service: If the door appears fine and the keypad responds but the unit will not start, a technician should test the door switches and main PCB relays.
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Repair Difficulty

Medium 3/5

Required Part

Door Switch Assembly / Control Panel
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