Thermador Microwave: Leaking Water
Usually condensation pooling, a steam-feature fault, or a blocked vent — true leaks are rare. 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.
If water is near the plug or outlet, don’t touch them. Switch off the microwave’s breaker first. Don’t stand in water to reach the breaker panel; if the panel is wet or you’d have to stand in water, leave it and call.
Don’t use the microwave until it’s dry and checked: parts inside hold a dangerous charge even when it’s off.
Take a photo of the microwave and where the water is coming from, without opening anything.
Everything else about this problem
Is it an emergency?
Is a Thermador microwave leaking water an emergency?
Usually urgent, and it can be an emergency. Turn off the water to it and unplug it or switch off its breaker, then soak up standing water. If water is reaching outlets or cords, switch off the breaker before touching anything; water coming through a ceiling is an emergency.
Symptoms & causes
Water pooling under your Thermador microwave or dripping from the door or vents typically indicates a leak. Common root causes include a worn or damaged door seal, a clogged or cracked waveguide cover, or excessive condensation buildup. For Thermador convection steam models, a cracked water reservoir or faulty internal water lines can also be the source of the leak.
Tools & parts
You will likely need a Phillips head screwdriver, a putty knife for prying, and possibly a multimeter for electrical checks. Replacement parts might include a new door seal (gasket) or a waveguide cover. If the issue is a cracked water reservoir in a steam model, that part and a small tube of food-grade silicone sealant for minor repairs may be needed.
Safety first
Always unplug the Thermador microwave from the wall outlet before beginning any inspection or repair to prevent electrical shock. Be aware that high-voltage capacitors inside microwaves can retain a dangerous charge even after unplugging, so avoid touching internal components unless you are trained to discharge them safely. Wear insulated gloves and safety glasses to protect against potential electrical hazards and sharp edges during the repair process.
When to call a pro
If the leak originates from inside the microwave cavity and is accompanied by arcing or burning smells, it often indicates a damaged magnetron or waveguide, which requires professional service due to high-voltage components. Persistent leaks after replacing the door seal or waveguide cover, especially if the unit is a convection steam model and the internal steam generator or water lines are compromised, suggest a complex repair best handled by a certified Thermador technician. Any situation involving a suspected cracked internal casing or a leak that appears to be coming from the high-voltage transformer area should immediately prompt a service call, as these are critical and dangerous failures.
Questions people ask
Why is my Thermador microwave leaking water from the door?
Water leaking from the door often indicates a worn, damaged, or improperly seated door seal (gasket). Inspect the seal for cracks, tears, or debris that might prevent a tight closure.
Can a clogged waveguide cause water to leak?
Yes, a clogged or damaged waveguide cover can sometimes lead to condensation buildup inside the cavity, which may then drip out and appear as a leak. Ensure the cover is clean and intact.
Is it safe to use my Thermador microwave if it's leaking water?
No, it is not safe to use a leaking microwave as water and electricity are a dangerous combination. Unplug the appliance immediately and do not use it until the leak is identified and repaired.
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Guides and hubs
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What it is, how urgent, who to call
Add a photo of your Thermador Microwave in the box at the top. The Triage Profile says what it is, how urgent it is, and who to call.