E6
Oster
High-voltage system fault (magnetron/transformer/capacitor/diode)
Microwave displays E6 and will not heat; turntable and light may still operate.
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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 high-voltage diode, Open high-voltage capacitor, Shorted magnetron, Faulty high-voltage transformer
How to Fix / Troubleshooting
Safety first: Unplug the microwave. The high-voltage section can be lethal. Only trained technicians should service the magnetron, transformer, capacitor, and diode. Do not attempt to discharge the capacitor without proper training.
- Basic user checks only: Confirm that the unit is on a dedicated outlet and that the house breaker is not tripping when you try to cook. If the unit hums loudly or smells burnt when trying to heat, stop using it immediately.
- Visual inspection (no contact): With the cabinet removed, visually inspect the high-voltage area for obvious burn marks or melted components. Do not touch any terminals.
- If E6 appears consistently: Discontinue use and contact a qualified appliance technician. The likely repair involves replacing the high-voltage diode, capacitor, transformer, or magnetron with Oster-compatible parts.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Diode
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