Siemens Overheating Component or Electrical Insulation Breakdown

Microwave emits a strong burning or electrical smell during or after 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

Food residue burning on grill element, failing high-voltage transformer, overheated wiring insulation, blocked cooling vents

How to Fix / Troubleshooting

Safety warning: If you smell strong burning plastic or see smoke, switch off and unplug the microwave immediately. Do not continue using it.

Steps to try:

  • 1. Identify source: Open the door and check for burnt food or splatters on the grill element or cavity walls.
  • 2. Clean thoroughly: Once cool, clean the interior, including the grill element (if accessible), with a suitable cleaner.
  • 3. Check vents: Ensure external vents are clear of dust and grease.
  • 4. Test briefly: After cleaning, run a short 30-second test with a cup of water. If the burning/electrical smell returns quickly, internal components may be overheating.

Persistent electrical smells indicate a failing transformer, wiring, or control board and require professional service.

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Repair Difficulty

Hard 4/5

Required Part

High-Voltage Transformer or Internal Wiring (as diagnosed)
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