A Thermador dishwasher that will not drain, often showing an E24 code, usually has a clogged filter, a blocked or kinked drain hose, or a jammed drain pump. Clearing the full drain path resolves the majority of these; the code is a symptom of restricted flow, not a control fault.
Thermador dishwashers ride the BSH platform, so a drain fault typically appears as E24. The first and most common cause is the filter at the bottom of the tub clogging with food debris, followed by the drain hose kinking or blocking behind the cabinet, a frequent pinch point in tighter installs. Clearing both restores flow in most cases.
If the filter and hose are clear, the drain pump is next. The impeller can jam on a shard of glass, a fruit pit, or a piece of label, which stops the pump from moving water. Removing the obstruction and testing the pump under load confirms the fix. A check valve stuck closed can also trap water in the tub.
Standing water in a Thermador is almost always mechanical rather than electronic, which is good news because the repair is straightforward. We clear the filter, hose, pump, and air gap, then run a full cycle to confirm the tub empties within the expected time. Only if the pump is confirmed dead do we replace it.
Quick Reference
| Cause | How It Shows | Fix |
|---|---|---|
| Clogged filter | Slow or no drain | Clean the filter |
| Kinked/blocked hose | Water stays in tub | Clear or reroute hose |
| Jammed drain pump | Pump hums, no flow | Clear or replace pump |
| Stuck check valve | Water backs up | Free or replace valve |
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