Thermador documents E22, E23, E24, and E25 as drainage-error codes, and the first checks are the filter, the drain pump cover, and the drain hose for kinks or blockage — all things a homeowner can safely inspect before calling. Food debris trapped in the filter basket is one of the single most common causes we find behind a drainage code.
If clearing visible debris from the filter and checking the drain hose for an obvious kink doesn’t resolve it, the drain pump itself likely needs attention, and that’s the point to book a diagnostic visit rather than keep restarting cycles.