Oster
Door interlock switch miswiring or failure
Microwave light and fan come on when door is opened, or unit tries to run with door open.
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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
Stuck or welded door switch contacts, Misaligned door latch, Incorrectly installed replacement switch, Shorted control board door input
How to Fix / Troubleshooting
Safety first: Unplug the microwave immediately. A microwave that runs with the door open is unsafe and must not be used.
- Do not operate: Leave the unit unplugged until repaired.
- Inspect door latch and hooks: Check for broken or bent hooks that may not fully release the switches.
- Advanced: Access the interlock switch assembly and test each switch with a multimeter. Replace any switch with welded contacts and ensure correct wiring per Oster’s schematic.
- If switches are correct: The control board may be misreading the door state and should be replaced by a professional.
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Repair Difficulty
Professional Required
5/5
Required Part
Door Interlock Switch Kit
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