Ariston Dishwasher Error Code AL 05

AL 05 is a clogged filters alarm indicating that the pressure switch contacts did not close after the water fill and filter cleaning cycle completed. The dishwasher expects to detect adequate water pressure through the filtration system, and when that pressure is not confirmed, it shuts down and displays AL 05. The fault can also be caused by wash motor circuit problems, including failed starter connections or a faulty motor condenser, rather than an actual filter blockage.

No, you should not continue running the dishwasher while AL 05 is active. The machine has halted its cycle because it cannot confirm proper water circulation, which means dishes will not be cleaned effectively and continued operation could put unnecessary stress on the wash motor or other components. Resolve the underlying cause before running another cycle.

If the fix is simply cleaning the filters, there is no parts cost involved. If a component needs replacement, a new pressure switch typically falls in the range of $15 to $50, a replacement motor run capacitor generally costs $10 to $30, and a replacement wash motor can range from $80 to $200 or more depending on the model. Labor costs for a technician will vary by region and the complexity of the repair.

Start by removing and thoroughly cleaning the mesh plate, main filter, and microfilter located at the bottom of the dishwasher tub. Rinse them under running water and clear any debris before reinstalling them. If the error returns after cleaning, the next steps are to inspect the wash motor starter connections for corrosion or looseness and to test the motor run capacitor and pressure switch for correct operation.

A reset may temporarily clear the display, but AL 05 will return on the next cycle if the root cause has not been fixed. The fault is triggered by a condition the control board actively monitors during every wash cycle, so simply resetting without cleaning the filters or addressing a motor circuit fault will not resolve the problem.