E-42
Samsung
Door Switch Error (Secondary Interlock)
Microwave shows 'E-42' and does not start when Start is pressed.
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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
Failed secondary door switch, Bent door latch, Loose or burned switch terminals, Faulty wiring harness
How to Fix / Troubleshooting
Safety: Unplug the microwave. Door switch circuits are part of the safety interlock system and must not be bypassed.
- Check for door sag: Inspect the door for sagging or misalignment. Lift gently on the handle to see if there is excessive play.
- Clean latch area: Remove any food debris or grease around the latch openings that might prevent full engagement.
- Professional repair: Testing the secondary switch requires access behind the control panel and removal of the cabinet. A technician should test continuity of the switch and replace it or adjust the latch bracket as needed.
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Repair Difficulty
Professional Required
5/5
Required Part
Secondary Door Switch
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