Café
Cavity Arcing / Waveguide Contamination
Microwave produces sparks or arcing inside the cavity during cooking.
Advertisements
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.
Advertisements
Possible Causes
Metal object in cavity, Damaged or burned waveguide cover, Exposed metal on cavity wall, Food splatter carbonized on walls
How to Fix / Troubleshooting
Safety first: Immediately press STOP/CANCEL and unplug the Café microwave if you see sparks.
Steps to try:
- Remove metal: Ensure there is no metal cookware, foil, twist ties, or utensils inside.
- Inspect waveguide cover: Look at the small rectangular cover (often on the side wall). If it is burned, cracked, or has holes, it must be replaced.
- Clean cavity: After cooling, clean the interior thoroughly to remove any burnt food or grease, especially near the waveguide cover.
- Test with water: After cleaning, run a short test with a cup of water. If arcing continues, stop using the unit.
- Service: A technician should replace the waveguide cover and inspect the cavity and magnetron antenna for damage.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Waveguide Cover
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements