Fagor High-Voltage Transformer or Magnetron Noise

Microwave makes loud buzzing or humming noise when running, louder than usual, with reduced 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

Failing high-voltage transformer, Shorted magnetron, Loose transformer mounting bolts, Saturated or failing high-voltage capacitor

How to Fix / Troubleshooting

Safety: High-voltage components are dangerous. Do not open the cabinet unless you are trained.

User checks:

  • Stop the microwave immediately if you hear unusually loud buzzing.
  • Check for any burning smell; if present, keep the unit unplugged.
  • Confirm that the noise occurs only when cooking (not when just opening/closing the door).

Because this symptom is typically caused by HV components, a professional should inspect and replace the transformer, magnetron, or capacitor as needed.

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Repair Difficulty

Professional Required 5/5

Required Part

High-Voltage Transformer
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