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Thermador Dishwasher won't start

If your Thermador dishwasher won't start, the most common causes are straightforward to check. A blown thermal fuse is the top suspect, since it cuts power to the machine if it overheats. Next, look at the door switch, which keeps the dishwasher from running unless the door is fully recognized as closed. If the start button seems to respond but the unit is still not starting, inspect the wire harness for broken or frayed wires that can interrupt power from the control board to key components. A broken door latch can also keep the door switch from engaging, and while the main control board can cause a Thermador dishwasher not starting issue, it is less likely than the fuse, switch, latch, or wiring. In some cases, a failed drain pump can also stop the cycle from beginning if the dishwasher cannot clear water before filling. If your Thermador dishwasher has power but will not start, enter your model number on RepairClinic.com to find the exact thermal fuse, door switch, wire harness, door latch, main control board, or drain pump that fits your specific dishwasher.

01 - Thermador Dishwasher Thermal Fuse

The thermal fuse shuts off power to the dishwasher if it overheats. If the thermal fuse blows, it will prevent the dishwasher from starting. To determine if the thermal fuse is defective, use a multimeter to test the fuse for continuity. If the thermal fuse does not have continuity, replace it.
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02 - Thermador Dishwasher Door Switch

The door switch prevents the dishwasher from running while the door is open. If the door switch is defective, the switch will prevent the dishwasher from running even when the door is closed. To determine if the door switch is at fault, use a multimeter to test the switch for continuity. If the switch does not have continuity, replace it.
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03 - Thermador Dishwasher Wire Harness

If the dishwasher start button appears to work, but the dishwasher still won't start, a wire harness which sends power from the control board to the pump components could be damaged. Inspect the wire harness for any frayed or broken wires and replace if necessary.
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04 - Thermador Dishwasher Door Latch

The door latch ensures that the dishwasher door latches shut. If the door does not latch properly, the door switch might prevent the dishwasher from running. If the door latch is broken, replace it.
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Highly Likely

05 - Thermador Dishwasher Main Control Board

The main control board provides power to nearly every component of the dishwasher. If there is a problem with the main control board, it might not send voltage to the dishwasher, causing the dishwasher not to start. Control boards are often misdiagnosed—make sure you check more commonly defective parts before replacing the main control board.
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Highly Likely

06 - Thermador Dishwasher Drain Pump

A dishwasher drain pump assists in removing the water from the tank at various times during operation. Since the unit will drain some water from the tank prior to the fill cycle beginning, a faulty drain pump unable to drain any water could prevent the dishwasher from starting.
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Highly Likely

Frequently Asked Questions

Why won't my Thermador dishwasher start even though it has power?
How do I know if the door latch or door switch is keeping my Thermador dishwasher from starting?
Can a blown thermal fuse keep a Thermador dishwasher from starting?
Can a Thermador dishwasher drain pump stop the dishwasher from starting?
How do I find the right Thermador dishwasher part for my model?

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