Zanussi
High Voltage Component Short or Overload
Microwave makes loud buzzing or humming noise when running, louder than usual, with little or no heating.
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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 diode, Shorted magnetron, Partially shorted high-voltage capacitor, Failing high-voltage transformer
How to Fix / Troubleshooting
Safety first: Stop the microwave immediately and unplug it.
- Do not continue use: Running the unit in this condition can damage additional components.
- Basic inspection: Check that there is no metal object or foil inside the cavity causing arcing.
- Professional repair: A technician will safely discharge the capacitor, test the high-voltage components, and replace the defective part.
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Repair Difficulty
Professional Required
5/5
Required Part
High Voltage Diode
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