Thermador Dishwasher Won't Start (Troubleshooting Guide)

On this page

Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

Check if the dishwasher is receiving power and the door is fully closed. Look for error codes on the display panel. If there's no power, reset the circuit breaker or check the outlet.

Confirm the symptom

Dishwasher door is closed but won't start
No power indicator lights or sounds
Control panel is unresponsive

Tools and prep

Screwdriver set
Multimeter (optional)
Owner's manual
Flashlight
Rubber mallet (optional)

Step-by-step troubleshooting

Check Power Supply
Do: Verify the dishwasher is plugged in and the circuit breaker hasn't tripped.
Observe: Power indicator lights or outlet functionality
Means: Power issue if no lights or outlet works
Next: Reset the circuit breaker if tripped
Inspect Door Latch
Do: Ensure the door is fully closed and the latch mechanism is engaged.
Observe: Door closure and latch alignment
Means: Latch issue if door doesn't close properly
Next: Adjust or clean the latch mechanism
Look for Error Codes
Do: Check the control panel for any displayed error codes.
Observe: Specific error code numbers or symbols
Means: Code indicates specific problem
Next: Refer to owner's manual for code explanation
Test Control Panel
Do: Press and hold the start button for 10 seconds to reset the control panel.
Observe: Control panel response or error code change
Means: Stuck or faulty control panel
Next: Unplug for 1 minute and plug back in
Check Water Supply
Do: Ensure the water inlet valve is open and the water supply is on.
Observe: Water flow to the dishwasher
Means: No water prevents start
Next: Inspect inlet valve for clogs
Test with a Different Cycle
Do: Select a different wash cycle and try starting again.
Observe: Dishwasher starts on a different cycle
Means: Cycle-specific issue
Next: Consult manual for cycle requirements

Common causes

Cause	Likelihood	Difficulty	Part often needed
Tripped Circuit Breaker Overload or short circuit in the electrical system	Common	Easy	None
Faulty Door Latch Switch Latch not signaling door is closed	Common	Easy–Medium	Door Latch Switch
Clogged Water Inlet Valve No water flow prevents dishwasher from starting	Sometimes	Medium	Water Inlet Valve
Failed Control Board Board not sending power to start the cycle	Rare	Hard	Control Board
Stuck or Faulty Start Button Button not registering input	Sometimes	Medium	Control Panel Assembly
Blocked Drain Hose Backflow or improper drainage can prevent start	Rare	Medium	Drain Hose or Pump

Parts matching

Common parts needed for a Thermador dishwasher that won't start include:

Door Latch Switch
Water Inlet Valve
Control Panel Assembly
Control Board
Drain Hose

Always cross-reference part numbers with your model's manual to ensure compatibility.

When to call a professional

If the control board shows no response after resetting
If you're unable to locate or replace electrical components safely
If error codes persist after troubleshooting
If the dishwasher still won't start after replacing suspected parts

FAQ

Why won't my Thermador dishwasher start even though it's plugged in?

Check the circuit breaker and ensure the outlet is working. A tripped breaker or faulty outlet can prevent power from reaching the dishwasher.

Can a dirty filter cause my dishwasher not to start?

A dirty filter typically affects cleaning performance, not the start function. Focus on power, water supply, and door latch first.

How do I reset my Thermador dishwasher control panel?

Press and hold the start button for 10 seconds, then unplug the dishwasher for 1 minute before plugging it back in.

What does error code E1 mean on a Thermador dishwasher?

Error code E1 usually indicates a water supply issue, such as a closed valve or clogged inlet filter.