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 producing a burning smell Repair
KitchenAid Microwave producing a burning smell
If your KitchenAid microwave smells like burning, stop using it and inspect the oven cavity for spilled food or grease that may be overheating. The most likely cause is a damaged or loose waveguide cover, which can arc and burn during cooking. Replace the cover if it is cracked, scorched, or will not stay in place. If the cavity is clean and the waveguide cover is sound, the power supply board may have a burned component or short and may need replacement. Next, inspect the high-voltage capacitor and capacitor for bulging, burn marks, or other damage, since either can overheat and create a microwave burning smell. A damaged thermostat can also produce a burning odor and should be checked for scorch marks. Use caution when diagnosing any component behind the outer cabinet. The high-voltage capacitor stores a lethal charge even after the microwave is unplugged, so it must be properly discharged before interior work. If you are not familiar with capacitor discharge procedures, have a qualified technician handle repairs involving the high-voltage system. Enter your model number to find the exact waveguide cover, power supply board, capacitor, or thermostat for your KitchenAid microwave.
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 Power Supply Board
If you've confirmed the oven cavity has been cleaned of all food debris and the waveguide cover is in good condition, a defective power supply board could be one of the components producing a burning smell. You should inspect the board for any burn marks or a shorted component and replace if necessary.
Top Solution
03 - KitchenAid Microwave High Voltage Capacitor
The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. A defective capacitor may overheat and produce a burning smell. Inspect the capacitor for visible damage or burn marks and replace if necessary.
Highly Likely
04 - KitchenAid Microwave Capacitor
The capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. A defective capacitor may overheat and produce a burning smell. Inspect the capacitor for visible damage or burn marks and replace if necessary.
Highly Likely
05 - KitchenAid Microwave Thermostat
If you've confirmed the oven cavity has been cleaned of all food debris and the waveguide cover is in good condition, a defective thermostat could be one of the components producing a burning smell. You should inspect the component for any burn marks or damage and replace if necessary.
Highly Likely
06 - Interior Cavity not Clean
Food that is left on the interior of the microwave can continue to cook each time the microwave is used, resulting in a burning smell. Always cover food when cooking to avoid splatter and wipe up any spills after use.
Highly Likely
Frequently Asked Questions
Why does my KitchenAid microwave smell like burning?
Can a damaged waveguide cover cause microwave sparking and a burning smell?
What if my KitchenAid microwave smells burnt but the cavity and waveguide cover look fine?
How do I test a KitchenAid microwave part linked to a burning smell?
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