Salter
Cavity Arcing / Waveguide Contamination
Microwave produces sparks or arcing inside the cavity during use.
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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 object or foil in cavity, Damaged or burnt waveguide cover, Exposed metal on cavity wall, Food splatter carbonised on waveguide cover
How to Fix / Troubleshooting
Safety: Stop the microwave immediately if you see sparks. Unplug before inspection.
Steps:
- 1. Remove metal: Ensure there is no metal cookware, foil, or metal-trimmed dishes inside. Only use microwave-safe containers.
- 2. Inspect waveguide cover: Locate the waveguide cover (usually a small mica or plastic panel on the side wall). If it is burnt, cracked, or has holes, it must be replaced.
- 3. Clean cavity: Thoroughly clean the interior, especially around the waveguide cover, to remove grease and burnt food deposits.
- 4. Replace cover: Fit a new Salter-compatible waveguide cover cut to the correct size and shape.
- 5. Test: Run the microwave with a cup of water. If arcing persists, there may be deeper cavity damage or magnetron issues requiring professional service.
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Repair Difficulty
Medium
3/5
Required Part
Waveguide Cover
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