Why Is My Microwave Sparking?
Sparking or arcing in a microwave can be caused by metal objects, damaged cavity paint, burnt food residues, a failing waveguide cover, or a damaged rack or accessory. Stop using the appliance until the cause is found.
Get a Confirmed Fit spare part
At Spares2Repair, when a spare part is matched to your exact model number we call that Confirmed Fit. Because spare parts can vary across production runs, sizes, and revisions, Confirmed Fit is the safest route to reduce wrong-part orders and buy with more confidence.
Option 1Search by full model numberEnter the full model number in the search box above to reach the most accurate spare-part route for your appliance and check for Confirmed Fit.
Option 2Use Fixit Fox FinderUpload a photo of the rating plate, describe the appliance, or get guided help if the model number is hard to read before you order.Option 3Browse spare partsBrowse the main spare-parts category for this appliance, then confirm compatibility by model number before checkout.Start with the search box whenever you have the full model number. Use Fixit Fox Finder if the rating plate is hard to read or you want guided help before ordering. Ordering by appearance alone is more likely to lead to the wrong part.
Browse Microwave spare partsWhat Confirmed Fit meansContact customer service
Before you order, use Confirmed Fit
For advice and repair topics like this one, the biggest buying mistake is ordering on appearance alone. Search by the exact model number wherever possible, because small appliance revisions can use different seals, filters, motors, pumps, lamps, shelves, or trims.
Step 1Find the full model numberUse the rating plate, product label, or model-number guide before comparing part photos or sizes.Step 2Understand Confirmed FitUse the full model code, not a short range name, because revisions and production runs can use different parts.Step 3Browse Microwave spare partsMove from advice into the relevant category page, then confirm compatibility by model number before buying.
At a Glance
- Sparking is not something to ignore because it can damage the cavity further.
- Many causes are visible on inspection and do not require deep disassembly to identify.
- Estimated time: 10-20 minutes for safe checks.
Safety First
Unplug the microwave and stop using it until the cause has been identified. Do not continue testing an appliance that is arcing.
Common Causes
- Metal cookware or foil
- Carbonised food residue
- Damaged or burnt waveguide cover
- Damaged cavity coating exposing metal
- Incorrect accessory or damaged shelf/rack
What to Check
- Remove any metal items and clean the cavity thoroughly.
- Inspect the waveguide cover for burning, grease saturation, or holes.
- Look for chipped cavity paint or exposed metal areas.
- Check that any racks or trays are the correct type for the model and mode.
FAQ
Why Is My Microwave Sparking?
Sparking or arcing in a microwave can be caused by metal objects, damaged cavity paint, burnt food residues, a failing waveguide cover, or a damaged rack or accessory. Stop using the appliance until the cause is found.
How do I get a Confirmed Fit microwave spare part for this fault?
Use the full model number exactly as shown on the rating plate. When Spares2Repair matches that model to a compatible part we call it Confirmed Fit. Similar-looking parts can differ across revisions, production runs, and variants, so model matching is the safest route before ordering.
When should I stop and get professional help?
Stop and seek qualified help if the work involves unsafe live electrics, sealed systems, gas-related risks, or damage that goes beyond straightforward model-matched part replacement.