Clatronic
Noisy High-Voltage Transformer or Magnetron
Microwave runs but makes a loud buzzing, humming, or growling noise that is much louder than normal.
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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, Defective magnetron, Vibrating cabinet panels
How to Fix / Troubleshooting
Safety first: Unplug the microwave if the noise is sudden or accompanied by smell or smoke.
User checks:
- Verify load: Never run the microwave empty. Always place a microwave-safe load (e.g., a cup of water) inside when testing.
- Check for loose external panels: Gently press on the sides and top of the cabinet while the unit is running (with water inside). If the noise changes, a loose panel or screw may be vibrating. Tighten accessible external screws (unplugged).
Technician checks:
- Inspect the high-voltage transformer mounting bolts and rubber dampers.
- Evaluate the magnetron and transformer for internal faults if the noise is electrical in nature.
Warning: Do not open the cabinet unless you are trained. Loud electrical buzzing can indicate dangerous HV faults.
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Repair Difficulty
Hard
4/5
Required Part
High-Voltage Transformer
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