Siemens Cavity Coating Degradation

Microwave cavity paint is peeling or rust is visible inside.

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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

Mechanical damage from abrasive cleaning, prolonged exposure to steam and spills, chipped enamel from impacts

How to Fix / Troubleshooting

Safety warning: Exposed rusted metal can lead to arcing. Do not use the microwave if arcing occurs from rusted areas.

Steps to try:

  • 1. Clean and dry: Gently clean the affected area with a mild detergent and soft cloth. Dry thoroughly.
  • 2. Inspect for arcing: Run a short test with a cup of water. If you see sparks from the rusted area, stop using the microwave.
  • 3. Touch-up (technician-level): Small areas can sometimes be treated with microwave-safe cavity paint applied by a technician.
  • 4. Replace if severe: Extensive rust or flaking may require cavity replacement or replacement of the entire appliance.

Avoid abrasive pads and harsh chemicals to prevent further damage.

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Repair Difficulty

Hard 4/5

Required Part

Cavity Enamel (Non-replaceable in many models)
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