Hotpoint Dishwasher Error Code AL03

The AL03 error code on a Hotpoint dishwasher indicates a drain timeout fault. During the drain cycle, the control board monitors the pressure switch to confirm the sump has reached an empty state within a set maximum time window. When that window expires and the pressure switch has not signaled an empty condition, the board logs AL03 and halts the cycle. This fault is rooted in the dishwasher's drain system, which includes the drain pump, the pressure switch, the drain hose, and the electrical connections linking these components to the control board.

The most frequent trigger is a physical obstruction somewhere in the drain path. Foreign objects such as broken glass, food debris, or labels can become lodged in the drain pump impeller, preventing it from moving water efficiently. A kinked or improperly positioned drain hose can also restrict flow, as can a blockage in the household standpipe or garbage disposal connection. An air bubble trapped in the pressure switch hose is another known cause, as this can prevent the switch from accurately reading the water level and falsely reporting that water remains in the sump.

Electrical faults contribute to AL03 as well. A disconnected or corroded pump connector can interrupt power to the drain pump entirely, so the pump runs briefly or not at all while the timer continues counting. If the drain pump itself has failed internally, it will not generate sufficient pressure to move water through the hose regardless of whether power is reaching it correctly. Systematic diagnosis should work through the mechanical causes first before moving to electrical testing of the pump and its wiring.