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03
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Microwave producing a burning smell
01 - 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.
Required Part
Microwave Waveguide Cover
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Most Common Solution
02 - 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.
Required Part
Microwave Power Supply Board
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Most Common Solution
03 - 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. If the capacitor shorts out, the line fuse or circuit breaker may trip. To determine if the high voltage capacitor is defective, test it using a VOM meter with a capacitance testing capability. (“Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due ...
Required Part
Microwave High Voltage Capacitor
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Most Common Solution
04 - 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.
Required Part
Microwave Thermostat
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Most Common Solution
05 - Interior Cavity not Clean
To avoid food splatter inside the microwave cavity, food should always be covered when cooking. Food that is left on the interior of the microwave can continue to cook each time the microwave is used. This can eventually cause a burning smell. Wipe up any spills or splatters after each use.
06 - Microwave Door Switch
Most microwaves have three or four door switches. When the microwave door closes, the door switches actuate in sequence to ensure that the door is closed properly. If the door switch has burnt contacts or the terminal connections are loose it will produce a burning smell. Inspect the door switches. if the switch smells burnt or has burnt connectors replace the door switch. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the micro...
Required Part
Microwave Door Switch
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Common Solution
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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.
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