Ariston Dishwasher Error Code AL 01

AL 01 is the overflow alarm, indicating that water has been detected in the base pan, the drip tray located beneath the dishwasher tub. A float switch in the pan transitions from open to closed when water lifts the float, and the alarm is signaled 9 seconds after that transition occurs. This is a safety feature designed to stop the appliance and alert you to a leak before water damage spreads.

No, you should not continue running the dishwasher while AL 01 is active. The alarm indicates water is present in the base pan, which means there is an active or recent leak. Running the appliance without addressing the leak risks additional water damage to the floor or cabinetry, and continued operation could stress other components.

Repair costs vary depending on the source of the leak. Replacing a door gasket or an inlet hose is generally a lower-cost repair, typically in the range of $20 to $80 for parts, plus labor if a technician is involved. A pump seal or internal component replacement can cost more, potentially ranging from $100 to $300 or higher depending on parts and labor rates in your area.

Start by pulling the dishwasher out enough to inspect the water inlet line, all visible hoses, and their connection points for any signs of leaking. Check the door gasket for tears or compression failure as well. Once you locate and repair the leak, the water in the base pan must be removed manually since the pan does not self-drain. After the pan is dry and the leak is corrected, the float switch will return to its open position and the alarm should clear.

A control board reset will not permanently clear AL 01 if the underlying leak has not been repaired. As soon as the dishwasher runs again, water will continue to enter the base pan, the float switch will close again, and the alarm will return within 9 seconds of that transition. The float switch must physically return to its open position, which requires the pan to be dry and the leak source to be corrected.