Thermador Dishwasher Not Working: Check the Door, Power, Water, and Drain

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   Record the model and what happens when you press Power or Start: no display, a display only with the door open, lights that flash, a selected cycle that does not begin, or a cycle that stopped with water inside. Do not reach into a running machine or open panels.

   Expected result: The display is dark, the display appears only in a documented door position, Start is unavailable, or the cycle stopped mid-program.

   Next step: Continue with the matching power, door/delay, water, or drain check and use the exact manual for reset instructions.

   Why this matters

   Why: The pattern separates power/display behavior from a latch, delay, water-fill, or drain state. A stopped cycle with standing water is not fixed by pressing Start repeatedly.

2. Check 2

   Confirm the dishwasher power switch is on and the door closes firmly until the latch engages. If the controls are on the top edge, open the door to view them; if a cycle was interrupted, select the manual's reset or CANCEL procedure once. Check that Delay Start is not active.

   Expected result: The door is not latching, a delay is active, the controls become available in the documented position, or the control state is normal but the machine remains idle.

   Next step: Correct only the documented door or delay state and retest once; do not force the latch or repeatedly reset.

   Why this matters

   Why: A door position, latch, delay, or unfinished-cycle state can prevent a new cycle without proving an electrical failure. A normal control state with no response needs the supply and water checks.

3. Check 3

   Verify the household water supply valve is open and inspect the visible inlet hose for a kink or crush. Do not disconnect a pressurized line. If the dishwasher fills but later stops, note whether the display shows an error or whether water remains in the tub.

   Expected result: The valve is closed, the hose is kinked, no water enters, or the unit fills normally and the fault is later in the cycle.

   Next step: Restore only an obvious valve or hose condition. Arrange service for an inaccessible restriction, leak, or persistent no-fill fault.

   Why this matters

   Why: A closed or restricted supply can look like a non-working dishwasher. Normal filling shifts attention to drain, filter, heating, or control behavior rather than the inlet.

4. Check 4

   If water remains after the cycle, inspect the accessible garbage-disposal connection and air gap for blockage, then select CANCEL/DRAIN as the manual describes. Remove and rinse the filter only according to the owner manual; do not uncover the drain pump unless the manual expressly permits it.

   Expected result: The drain path is blocked, the filter is coated, water drains after the documented check, or water remains with accessible paths clear.

   Next step: Retest once after an accessible blockage is cleared. Use authorized service for pump access, a blocked hose, leak, or repeated drain failure.

   Why this matters

   Why: A blocked disposal, air gap, filter, or drain line can stop a cycle or leave the dishwasher full. Persistent water with a clear external path makes pump or installation service more likely.

5. Check 5

   Run one short, model-approved test cycle after the correction and record fill, spray, drain, heat, display, and stop behavior. Keep the floor dry and stop if the unit leaks, smells hot, sparks, or trips the breaker.

   Expected result: The cycle completes, remains idle, stops again, leaves water, or presents a safety symptom.

   Next step: Stop repeated testing and contact Thermador authorized service with the model, display state, water level, and timing.

   Why this matters

   Why: Completion after one documented correction supports a door, delay, supply, filter, or accessible drain state. Recurrence or a safety symptom requires diagnosis beyond user checks.