Samsung Door Switch / Relay Stuck On

Microwave light, fan, and turntable come on as soon as the door is closed, without pressing Start.

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.

Possible Causes

Shorted door switch, Misadjusted latch bracket, Stuck relay on main PCB, Wiring short in interlock circuit

How to Fix / Troubleshooting

Critical safety: Unplug the microwave immediately. A unit that runs with the door closed but without a start command may have a serious interlock failure.

Do not use: Do not attempt to operate the microwave until it has been inspected and repaired.
Visual door check: Inspect the door and latch hooks for obvious damage or warping.
Professional repair only: Door switch and relay faults must be corrected by a qualified technician to ensure radiation safety.

Repair Difficulty

Professional Required 5/5

Required Part

Door Switch Assembly / Main Control Board

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