RCA Door Interlock or Control Input Failure

Microwave has power but will not start when START is pressed; no error code.

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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

Door not fully closed, Misaligned door latch, Failed door switch, Defective START key on keypad

How to Fix / Troubleshooting

Safety Warning: Unplug the microwave before accessing door switches or control panel.

Checks:

  • 1. Confirm door closure: Open and firmly close the door. Ensure nothing is obstructing the door seal.
  • 2. Try multiple keys: See if other functions (clock, timer, light) respond. If only START fails, the keypad may be worn.
  • 3. Listen for relay click: When pressing START, listen for a faint click from inside. No click may indicate the control board is not sending a start signal.

If the door appears fine but the unit still will not start, the door switches or keypad/control board likely need testing and replacement by a technician or experienced DIYer.

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Repair Difficulty

Medium 3/5

Required Part

Door Switch Assembly
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