Thermador Microwave: Making Loud Noise
Often a failing magnetron, a worn turntable motor, or a bad cooling fan. Add a photo of your Thermador Microwave in the box below: the Triage Profile says what it is, how urgent it is, and who to call.
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In the next five minutes
Safe first steps, before the call. Nothing here needs a tool.
Note what the noise sounds like and when it happens, then stop the microwave and switch off its breaker, or unplug it if the plug is dry and easy to reach.
Take a photo of the microwave and any code on the display, without opening anything.
Don’t use it again until it’s checked, and keep people away from it.
Everything else about this problem
Is it an emergency?
Is a loud noise from a Thermador microwave an emergency?
Usually not, but it can be. A grinding, rattling or humming that has just started most often comes from a fan, motor, belt or loose panel. Stop using it and cut the power if the noise comes with a burning smell, smoke or sparks.
Symptoms & causes
Loud noises in a Thermador microwave often manifest as grinding, buzzing, humming, or rattling sounds during operation. These noises can stem from various internal components, including a failing turntable motor, a worn-out cooling fan, or issues with the high-voltage system. A persistent loud noise usually indicates a mechanical or electrical fault that requires immediate attention to prevent further damage or safety hazards.
Tools & parts
For testing and repair, you will need a basic screwdriver set, a multimeter for testing electrical components, and insulated pliers. Common replacement parts might include a new turntable motor, a cooling fan motor, or a high-voltage diode. Always ensure you purchase genuine Thermador or compatible OEM parts for optimal performance and safety.
Safety first
Before attempting any inspection or repair, always unplug your Thermador microwave from the wall outlet to eliminate the risk of electrical shock. Be aware that the high-voltage capacitor inside can store a lethal electrical charge even after the unit is unplugged; it must be safely discharged using a ceramic-insulated screwdriver or a high-value resistor. Wear insulated gloves and safety glasses to protect against sharp edges and potential electrical hazards during the repair process.
When to call a pro
If your Thermador microwave exhibits arcing inside the cavity, a strong burning smell, or if the magnetron or high-voltage transformer is suspected to be faulty, professional service is highly recommended. These components deal with extremely high voltages and require specialized testing tools and expertise for safe and effective repair. Attempting to service these critical high-voltage parts without proper training can be extremely dangerous and may void your warranty.
Questions people ask
Why is my Thermador microwave making a loud buzzing noise?
A loud buzzing noise often indicates a problem with the high-voltage transformer or the magnetron, which are crucial for generating microwaves. It could also be a faulty high-voltage diode, causing the transformer to hum excessively.
What if the noise is a grinding sound?
A grinding sound typically points to an issue with the turntable motor or the stirrer motor, which rotates the fan-like component above the cavity. Check for any obstructions under the turntable tray and inspect the motor for signs of wear or damage.
Is it safe to use my Thermador microwave if it's making loud noises?
It is generally not safe to continue using a microwave that is making unusual loud noises. Unplug the unit immediately as it could indicate a serious electrical fault, a failing component, or a potential fire hazard.
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What it is, how urgent, who to call
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