Thermador Dishwasher E3400 and Water That Keeps Running In

What E3400 means

Compared with the website, the owner manual speaks more sharply. For the split spelling E:34-00 it says water enters the appliance without interruption, as if the fill never ends, and it begins with closing the supply valve. For that reason E3400 is handled as urgent, not as a routine intake complaint. Treat it with more caution than any ordinary filling message.

Usual causes of E3400

An inlet valve jammed open, whether mechanically or electrically
A control output keeping the fill valve energized after it should release
Grit under the valve seat preventing a full seal

✓ A safe check worth trying

SAFETY FIRST. 1. Close the dishwasher's supply valve at once, because an intake that cannot shut is a flooding hazard. 2. If water is reaching the floor, turn the circuit off at the panel. 3. Do not run cycles. 4. After that, book a visit.

! Why you should stop here

Once the valve sticks open, water continues to enter whether or not a cycle is running, so the supply should be closed immediately.
The inlet valve is mounted at the water connection behind the toe panel and is changed only with the supply isolated.

Taking off a panel yourself does not by default void a manufacturer warranty, yet it can lead to accidental damage, and some manufacturers attach their own service terms. Read your warranty paperwork, or ask us, before you decide.

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More Dishwasher codes

E9240Thermador Dishwasher E9240: Water Will Not Leave the Tub E9210Thermador Dishwasher E9210 Flags a Bottom Spray Arm That Will Not Turn SAnlThermador Dishwasher "SAnl" Message: Sanitize Finished E:07Thermador Dishwasher E:07: Dishes Covering the Intake Opening All LEDs light up or flashThermador Dishwasher "All LEDs light up or flash": Update or Reset E3100Thermador Dishwasher E3100 Trips Leak Protection Over Water in the Base Tray E3200Thermador Dishwasher E3200: Fill Falls Short of the Level the Board Wants E3300Thermador Dishwasher E3300: Intake Blocked or Absent

E3400E3400 questions

The dishwasher is off. Could water still enter?

If the inlet valve itself is jammed open, yes. That is why the manual starts with the supply valve rather than the electricity. We do not rush a diagnosis.

The website groups this with E3300. Are they the same?

The website gives both one description, but the manual's wording for E3400 is more detailed and more serious. We treat it as the urgent one.

May I leave the supply closed until you come?

Yes, that is the correct interim step. Leave it closed until we have tested the inlet valve and confirmed it seals. A photo of the display can be useful.