Balay
Magnetron or Transformer Acoustic Noise
Microwave emits a high-pitched squeal or whine during operation.
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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
Aging magnetron,Loose transformer laminations,Mechanical resonance in cabinet panels,Inverter switching noise (inverter models)
How to Fix / Troubleshooting
User-level:
- Verify that the microwave is placed on a stable, level surface and not touching other appliances or walls that can resonate.
- If the noise is new and pronounced, discontinue use and have it inspected.
Technician-level:
- Identify whether the noise originates from the magnetron, transformer, or cabinet.
- Tighten mounting screws and add damping where appropriate.
- Replace the magnetron or transformer if the noise is accompanied by poor heating or overheating.
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Repair Difficulty
Hard
4/5
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