Unlock the Right Part
for Your Repair
Find the exact part you need
Enter your model number to see parts that fit your machine.
Price Match Guarantee
In-stock parts ship the same day
365-Day Return Policy
Price Match GuaranteeChoose Product
Identify Problem
03
Find Solutions
HomeRepair HelpKitchenAid Microwave RepairKitchenAid Microwave is sparking or arcing Repair
KitchenAid Microwave is sparking or arcing
When your KitchenAid microwave is sparking inside, stop using it and identify where the microwave arcing occurs. The most likely cause is a damaged or loose waveguide cover, which can burn or arc in the oven cavity and should be replaced. If sparks appear in the cabinet area, a shorted door switch may be responsible. Inspect the primary, secondary, and monitor door switches for burn marks or damage, then test them with a multimeter. Arcing behind the waveguide cover can also indicate a damaged magnetron or high-voltage diode, while burnt shelf supports or chipped interior paint can expose metal and cause sparks and pops. Sand damaged paint lightly and apply approved microwave touch-up paint. Any repair that requires removing the outer cabinet, including work on the magnetron or high-voltage diode, requires caution because the high-voltage capacitor can store a lethal charge even after the microwave is unplugged. The capacitor must be properly discharged before interior work, and a qualified technician should handle the repair if you are not familiar with that procedure. Enter your KitchenAid microwave model number to find the exact replacement part for your appliance.
01 - KitchenAid Microwave Waveguide Cover
The waveguide cover might be damaged and arcing or burning. If this is the case or if the cover will not stay in place, replace it with a new one.
Enter model number to search for the required part specific to your product
Top Solution
02 - KitchenAid Microwave Door Switch
If the microwave is sparking or arcing in the cabinet area, and not in the oven cavity, you will likely see smoke or there will be a burning smell. One of the appliance's door switches could have shorted and is causing the sparking or arcing. You should inspect each door switch for burn marks or damage and test the components with a multimeter to determine if any the door switches are malfunctioning.
Top Solution
03 - KitchenAid Microwave Magnetron
If the microwave is sparking or arcing behind the waveguide cover in the oven cavity, you will likely see smoke or there will be a burning smell. The appliance's magnetron is one of the components that could be damaged and causing the sparking or arcing. Inspect the magnetron for burn marks or damage and replace if necessary.
Top Solution
04 - KitchenAid Microwave Diode
If the microwave is sparking or arcing in the cabinet area, and not in the oven cavity, you will likely see smoke or there will be a burning smell. The appliance's diode is one of the components that could be damaged and causing the sparking or arcing. When the diode fails, it is often visibly burned out. Inspect the diode and if the diode is burned out, replace it. If inspecting the diode proves inconclusive, test it with a multimeter that uses a 9-volt battery or put a 9-volt battery in series with the diode. When the leads are reversed, the diode should only have continuity in one direction..
Top Solution
05 - KitchenAid Microwave Shelf Support
Some microwave ovens will have cooking shelf supports on the interior walls. Inspect the shelf supports for any burnt spots or damage. If there are any burnt or damaged spots, replace with new supports as needed.
Top Solution
06 - KitchenAid Microwave Touch-Up Paint
The paint on the interior of the microwave might be chipped. If the paint is chipped, the interior metal will be exposed, causing the microwave to spark or arc. Check the interior of the microwave for any spots where the paint has chipped away. If there are any damaged spots, gently sand the compromised area and touch them up with microwave oven interior paint.
Top Solution
Frequently Asked Questions
What should I do if my KitchenAid microwave is sparking inside?
Is the waveguide cover the most common cause of microwave sparking?
Why is my KitchenAid microwave sparking in the cabinet area instead of the oven?
Could the magnetron be causing my microwave to spark?
How do I find the correct KitchenAid microwave waveguide cover or other replacement part?
Shop by KitchenAid Microwave Parts
Shop by Popular KitchenAid Microwave Models
Our Story
Family-owned and operated since 1912, Burke America Parts Group is the longest-running genuine appliance, HVAC, and outdoor power equipment parts solution in North America. At Repair Clinic, we're proud to be an international brand trusted by the pros as well as the DIY community.
About Repair Clinic
© 2026 RepairClinic.com