Thermador dishwasher not draining properly — normal operation · e24

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

1. Check 1

   Stop the dishwasher and photograph the full display, including whether it reads E24 or E-24, when it appeared, and whether the tub contains standing water. If there is visible water at the base, a leak, flooding, smoke, sparks, a burning odor, or water near electrics, stop without attempting a drain test.

   Expected result: The code is clearly E24/E-24 with water remaining, or the display is different, incomplete, or accompanied by a safety symptom.

   Next step: If safe and dry, keep the photo and continue with visible checks. Shut off water and isolate power only from a safe position for a leak or electrical hazard; otherwise arrange qualified service immediately.

   Why this matters

   Why: Thermador gives E24 a drain-path meaning, but exact display format and model manual still matter. A base-water or electrical symptom changes the job from routine drain-path checking to a safety stop.

2. Check 2

   With the dishwasher off and de-energized, inspect the accessible filter and sump area only as the exact owner manual permits. Remove loose food debris from the filter and confirm any accessible pump-cover area is correctly seated; do not reach into a concealed pump, remove panels, or use tools to force a cover.

   Expected result: The filter is blocked, the manual-permitted cover is loose, or the accessible area is clear and the cover is seated.

   Next step: Restore only the manual-approved filter or cover position and run no more than one supervised drain check when there is no leak or electrical hazard. If E24 returns, stop and request service.

   Why this matters

   Why: Thermador lists a blocked filter/pump area or loose pump cover among possible E24 causes. Finding debris supports a drain restriction, but a clear area does not prove the pump or control is defective.

3. Check 3

   From outside the appliance, trace the drain hose route under the sink or cabinet. Look for a visible kink, sharp bend, crushing, sagging, or a hose that bypasses the required high loop. Check the air gap, garbage-disposal inlet, or sink connection for an obvious blockage without disconnecting a pressurized water line or dismantling plumbing.

   Expected result: A kink, crush, low route, obstructed air gap, blocked disposal inlet, or other visible routing/connection problem is present; or the exterior route appears clear.

   Next step: Correct only an obvious accessible routing issue that can be restored without moving or opening the dishwasher. If plumbing work, appliance removal, or a high-loop change is needed, use a qualified installer or service technician.

   Why this matters

   Why: Thermador specifically lists a kinked drain hose and blocked air gap/drain hose as E24 possibilities, and its troubleshooting page requires a high loop between 20 and 50 inches above the floor for proper pumping. A clear exterior route does not identify an internal part.

4. Check 4

   If and only if the exact manual/installation instructions permit it, make a temporary, supervised observation with the drain hose secured in a large stable bucket or container, with the dishwasher off before repositioning the hose and no person standing in water. Do not place the hose on the floor or leave the appliance unattended.

   Expected result: The hose discharges into the container without obvious restriction, or it still drains poorly/does not drain; water spills, the hose comes loose, or the setup cannot be made safe.

   Next step: Stop the observation, reconnect the hose to its specified high loop/air-gap or disposal connection, and do not use the bucket or a floor drain for normal operation. If the hose remains slow or E24 returns, arrange service.

   Why this matters

   Why: A difference between the temporary controlled route and the normal sink/air-gap connection can make external drain-path resistance more likely. It does not prove the pump is good, prove another component is bad, or override the installation requirements.

5. Check 5

   Confirm the dishwasher is level and that the visible drain route, air gap, sink/disposal connection, and filter are restored. Record whether E24 occurred at the end of a cycle, immediately after a drain command, or only when the household connection was used. Do not tilt, pull out, or run with an altered discharge route.

   Expected result: The external path was corrected and one permitted supervised drain check completes, or E24 returns, the tub retains water, or the appliance leaks.

   Next step: If the symptom clears, return to the specified installation and monitor one normal cycle. If it returns or the appliance leaks, stop using it and book Thermador or qualified service with the code and sequence.

   Why this matters

   Why: A cleared external restriction supports a user-installation or plumbing contribution. A returning code or retained water after visible checks leaves several internal and external possibilities and cannot be reduced to a pump diagnosis.

6. Check 6

   Prepare the service handoff: provide the full model/E-Nr from the rating plate, market, exact code formatting, cycle and timing, standing-water amount, filter/cover result, hose/high-loop and air-gap observations, and the result of any permitted temporary route check. Do not enter a service mode or test live circuits.

   Expected result: The exact model and evidence are available, or the model is missing and the same E24 condition persists.

   Next step: Arrange qualified service for a recurring or unexplained E24. Ask the technician to inspect the whole drain path and safety condition; do not pre-order a pump or control board from the code alone.

   Why this matters

   Why: Thermador's troubleshooting guidance repeatedly sends owners to the matching owner's manual and service when the drain problem remains. Model, market, and sequence let the technician separate platform-specific procedures without guessing.