ApplianceField Lab
Critical interlock case · Samsung

The New Board Did Not Change the Door-Triggered Startup

Because the symptom followed door movement and survived a board replacement, the latch hooks and interlock-switch sequence became the immediate safety concern.

Microwave Samsung Starts When Door Opens
Case snapshot

What the source establishes

  • Opening the microwave door caused the appliance to start.
  • Replacing the control board did not change the symptom.
  • The expert replies redirected the diagnosis to the door switches and latch hooks.
  • The video frames showed the door movement but could not prove motor operation in a still image.
  • No interlock test or completed repair was reported.

A similar symptom can have a different cause on another appliance or model.

Diagnostic process

How the evidence narrowed the diagnosis

Trigger

Opening the door started the appliance

The failure was mechanically linked to the latch movement.

Failed attempt

A new control board did not help

That result moved the diagnosis away from repeating the board path.

Interlock branch

Door switches and hooks came next

Both switch state and the latch geometry that actuates it require verification.

What the evidence supports

What the evidence supports

The source supports a door-interlock or latch-hook fault as the next diagnostic branch. It does not identify which switch failed, and the microwave must not be operated in this state.

What to do next

What should be verified next

Disconnect the microwave and record exactly what starts when the door moves. Qualified service must inspect latch alignment and test the complete interlock sequence before power is restored.

Immediate microwave safety: unplug the unit and do not operate it. Door interlocks protect against microwave energy and high-voltage hazards; never bypass or jumper a switch.
Unexpected turn

A repair that did not follow the obvious path

An unusual turn supported by the case record Sub-Zero Not Cooling One Month After Sealed-System Repair A Sub-Zero stopped cooling a month after compressor and evaporator work. A clean evaporator shifted the diagnosis toward an oil-line restriction; the final repair …
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