Severin
High-Voltage Transformer or Magnetron Noise
Microwave makes a loud buzzing or humming noise during operation, louder than usual.
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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
Failing high-voltage transformer, Loose transformer mounting bolts, Magnetron internal fault, High-voltage arcing
How to Fix / Troubleshooting
Safety first: Unplug the microwave. High-voltage components are dangerous; limit work to visual and mechanical checks.
- Step 1 – Compare with normal: Some hum is normal, but a sudden increase or harsh buzzing indicates a problem.
- Step 2 – Check for loose mounting: With the cabinet removed, gently check that the HV transformer is firmly bolted to the chassis. Tighten loose bolts.
- Step 3 – Inspect for arcing: Look for burn marks or carbon tracking around the transformer, magnetron, and HV wiring. Do not touch these parts.
- Step 4 – Stop use if noise persists: Continued loud buzzing may indicate a shorted component. Discontinue use and have a technician test the transformer and magnetron.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Transformer
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