Bosch Dishwasher Error Code E:24

Bosch E:24 is a drain fault code that triggers when the dishwasher detects that water has not been fully evacuated by the end of the wash cycle. The control board monitors the drain system and flags this error when standing water remains in the sump or tub after the drain pump has run. Because the cycle ends prematurely without completing the drain phase, dishes are left wet and water pools at the bottom of the unit.

The drain system on Bosch dishwashers relies on several components working in sequence: the drain pump, the backflow check valve, the drain hose routing, and the connection point at either a garbage disposal or a sink drain standpipe. A clogged filter assembly or blocked sump is the most frequent trigger, but installation-related issues are nearly as common. The drain hose must not exceed 150 inches in total length and requires a high loop installed no lower than 33 inches, with the connection point no higher than 50 inches above the floor. A kinked or improperly routed hose creates enough back pressure to prevent full drainage even when the pump is functioning correctly.

Less commonly, the backflow check valve inside the drain path can become stuck or fouled with debris, preventing water from exiting while also blocking re-entry of drain water. On units equipped with a heat pump, a seized or resistance-bound impeller on the heat pump assembly can also contribute to incomplete drainage. Begin diagnostics by inspecting float switch connections and continuity, confirming the garbage disposal knockout plug has been removed if the drain connects there, and verifying hose routing before moving on to internal components.