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HomeRepair HelpBosch Microwave RepairBosch Microwave producing a burning smell Repair
Bosch Microwave producing a burning smell
If your Bosch microwave smells like burning, stop using it until you identify the source. The most likely cause is a damaged or loose waveguide cover that is arcing or burning inside the oven cavity. Replace the Bosch microwave waveguide cover if it is scorched, cracked, or will not stay in place. If the cavity is clean and the cover is sound, inspect the power supply board for burn marks or a shorted component. A failing high-voltage capacitor or capacitor can overheat and produce a microwave burning smell, and a damaged thermostat may also show burn marks or create a burning odor. Food debris and splattered grease left inside the cavity can continue cooking and may be the source of the smell, so clean the interior thoroughly before testing the microwave again. Any repair that requires opening the outer cabinet, including work on the power supply board, high-voltage capacitor, high-voltage diode, or transformer, is hazardous because the capacitor can store a lethal charge even after the microwave is unplugged. Proper capacitor discharge is required, and a qualified technician should handle the repair if you are not familiar with that procedure. Enter your Bosch microwave model number to find the exact replacement part for your appliance.
01 - Bosch 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.
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02 - Bosch 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.
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03 - Bosch 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 - Bosch 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 - Bosch 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 Bosch microwave smell like burning?
Can a Bosch microwave waveguide cover cause burning or sparking?
What parts can cause a Bosch microwave burning smell after the cavity is clean?
How do I test a Bosch microwave thermostat or capacitor for a burning smell?
How do I find the correct Bosch microwave waveguide cover or other replacement part?
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