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Thermador Dishwasher overflowing

If your Thermador dishwasher is overflowing, start with the most likely cause: a faulty water inlet valve. When this valve sticks open or does not shut off fully, the dishwasher can overfill, leave the water level too high, or let water drip into the tub even when the machine is off. The next thing to check is the main control board, since a shorted board can keep sending power to the water inlet valve during the cycle. A damaged lower wash arm assembly can also mimic a Thermador dishwasher overflowing problem by spraying water out the bottom of the door, making it look like the dishwasher is leaking or overfilling. After that, consider whether too much detergent or the wrong detergent is causing oversudsing, then inspect the float switch or safety float, which is designed to stop the fill before the dishwasher overflows. If your dishwasher overfills with water or you are dealing with a dishwasher float switch problem, enter your model number on RepairClinic.com to find the exact Thermador replacement part that fits your machine.

01 - Thermador Dishwasher Water Inlet Valve

The water inlet valve is an electrically-controlled valve that opens to allow water to enter the dishwasher. Depending on the model, the valve stays open either for a set length of time or until the dishwasher has enough water. However, if the water inlet valve doesn’t shut off after the dishwasher has enough water, the dishwasher will overflow. If water drips into the dishwasher when the door is open, or if water collects at the bottom of the dishwasher while it is not use, you may need to replace the water inlet valve.
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02 - Thermador Dishwasher Main Control Board

A dishwasher's main control board provides power to nearly every electrical component in the dishwasher. If the control board continues to send power to the water inlet valve during the drain cycle, the dishwasher could overflow. While this is not that common of a problem, you can inspect the board for signs of burning or a shorted-out component. You can also use a multimeter to test the water inlet valve for incoming power during the dishwasher's cycle.
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03 - Thermador Dishwasher Lower Wash Arm Assembly

If the lower wash arm has a crack or split on the side it can cause water to splash out the bottom of the door, giving the impression that the dishwasher is overflowing. Inspect the wash arm assembly for any damage and replace if necessary.
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04 - Wrong type or incorrect amount of detergent

Make sure to use the proper dishwasher detergent. Use the proper amount of detergent for your water hardness; too much soap in soft water can cause oversudsing and leaking.
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05 - Thermador Dishwasher Control Board

A dishwasher's control board provides power to nearly every electrical component in the dishwasher. If the control board continues to send power to the water inlet valve the dishwasher could overflow. While this is not that common of a problem, you can inspect the board for signs of burning or a shorted-out component. You can also use a multimeter to test the water inlet valve for incoming power during the dishwasher's cycle.
Common

06 - Thermador Dishwasher Float Switch

The float switch actuates in order to prevent the dishwasher from overflowing. If the float switch is defective or stuck, it might not stop the dishwasher from overflowing. If the float switch is defective, replace it.
Common

Frequently Asked Questions

Why is my Thermador dishwasher overflowing with water?
How do I know if the water inlet valve is bad on my Thermador dishwasher?
Can a float switch cause a Thermador dishwasher to overfill?
Why is my Thermador dishwasher leaking from the door and looking like it is overflowing?
How do I find the right overflow-related part for my Thermador dishwasher?

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