SMEG
Cavity Arcing / Waveguide Contamination
Microwave produces sparks or arcing inside the cavity during cooking.
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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
Metal objects or foil in cavity, Damaged or burned waveguide cover (mica plate), Exposed metal on cavity wall, Food splatter carbonized on walls
How to Fix / Troubleshooting
Safety: Stop the microwave immediately and unplug it if you see sparks or arcing.
User checks:
- Remove any metal objects, foil, or dishes with metallic trim from the cavity.
- Inspect the interior walls and ceiling for burned spots or peeling coating.
- Locate the waveguide cover (usually a small rectangular mica or plastic plate on a side wall). Check for burns, holes, or heavy grease buildup.
Cleaning:
- Clean the cavity thoroughly with a mild detergent and soft cloth. Remove all food splatter, especially near the waveguide cover.
- Allow to dry completely.
If the waveguide cover is damaged:
- Do not operate the microwave. The cover must be replaced with the correct SMEG part.
Persistent arcing or visible damage to the cavity coating requires professional inspection.
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Repair Difficulty
Medium
3/5
Required Part
Waveguide Cover (Mica Plate)
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