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 HelpRoper Microwave RepairRoper Microwave producing a burning smell Repair
Roper Microwave producing a burning smell
If your Roper microwave smells like burning, stop using it until you identify the source. The most likely cause is a damaged or loose waveguide cover, which can arc or burn while the microwave runs. Replace the waveguide cover if it is scorched, cracked, or will not stay in place. If the cover is sound and the cavity is clean, inspect the power supply board for burn marks or a shorted component. A failing high-voltage capacitor or capacitor can overheat and create a burning smell, as can a damaged thermostat. Food debris left inside the oven cavity may also continue cooking and cause a microwave burning smell, so wipe up spills and clean splatters before testing the appliance. Any repair that requires removing the outer cabinet involves serious electrical danger. The high-voltage capacitor can store a lethal charge even after the microwave is unplugged and must be properly discharged before interior work. If you are not familiar with capacitor discharge procedures, have a qualified technician inspect the power supply board, high-voltage capacitor, or related components. Enter your Roper microwave model number to find the exact replacement waveguide cover or other part for your specific appliance.
01 - Roper 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 - Roper 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 - Roper 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 - Roper 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 - Roper 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 Roper microwave smell like burning?
Can a damaged waveguide cover cause a microwave burning smell or sparks?
How do I tell whether food debris or a failed part is causing the burning smell?
Is it safe to replace a Roper microwave power supply board or high-voltage capacitor myself?
How do I find the correct Roper microwave waveguide cover or replacement part?
Shop by Roper Microwave Parts
Shop by Popular Roper 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