Oster
Overcurrent or thermal protection trip
Microwave runs for a few seconds then shuts off completely; display goes dark until unplugged and replugged.
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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
Shorted high-voltage component, Weak line fuse or thermal fuse, Failing magnetron drawing excessive current, Faulty main control board relay
How to Fix / Troubleshooting
Safety first: Unplug the microwave. Repeated tripping can indicate a dangerous internal fault.
- Try a different outlet: Plug into a dedicated outlet (no extension cords) to rule out a weak circuit.
- Observe behavior: If the unit always shuts off at the same point, an internal protection device is likely opening.
- Do not repeatedly reset: This can worsen damage. Internal diagnosis of high-voltage parts and thermal fuses should be done by a technician.
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Repair Difficulty
Professional Required
5/5
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