An Ariston dishwasher speaks a clear language called AL: a code on the display, or a fixed blink pattern on models without one. This page is your full reference — every code with its meaning and the safe first action, in the same order our technicians work.
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The full AL code table
AL01 — a water leak (Aqua Stop triggered): the most important code on the list. The dishwasher sensed water in its base and shut off the tap itself to protect your kitchen. The action: close the water tap, unplug, dry what’s visible — and that’s it. No tilting or restarting: the leak is still there, and the technician determines its source (a gasket, a hose, a pump connection), fixes it, then resets the system. AL02 — a water-fill problem: open the tap fully and clean the hose-inlet filter. Persisting = the fill valve. AL03 — a drainage problem (the most common): clean the bottom filters of food debris, check the drain hose for kinks and its connection to the sink, and try a short program. Persisting = the drain pump or the level sensor. AL04 — the temperature sensor (NTC): unplug for a few minutes and restart. Persisting = the sensor and its connections. AL05 — the circulation pump or pressure switch: clean the filters and try. Persisting = a check of the main pump — the heart of the dishwasher, diagnosed with a meter. AL06 — the water-fill valve: close and open the tap and try again. Persisting = the valve or the board. AL08 — the water isn’t heating in time: its side symptom — the detergent tablet is half-dissolved and the dishes greasy. Try a shorter program to compare — persisting = the heating element (usually limescale behind it) or the sensor. AL09 — a software error: unplug for a full 10 minutes. Persisting = reprogramming or a board change. AL10 — the heater circuit or relay: unplug and restart once — then a technician check of the board and heater. AL99 — loss of communication between boards: unplug and restart — persisting = the connections and boards.
Rules for dealing with any AL code
AL01 is an exception to every rule: there’s no “try again” with it — a leak means a leak, and running it before the repair endangers your kitchen and the one below you. The correct restart is 10 minutes, not seconds — boards need a full discharge. Egypt’s water is part of the story: half of our dishwasher faults trace back to limescale — which is why on any service visit we set up the salt system and the water-hardness regulator for your area’s water, and that’s the real line of defence. Blinks = codes: model without a display? Count the consecutive blinks before the stop — that’s the code number.
Bottom line
AL codes are your quick guide: AL03 and the filters are usually solved at home, AL08 is confirmed by the detergent tablet, and AL01 is a mandatory stop until the technician determines the leak. And any code fixed after the restart = one visit with a genuine part and a full salt-system setup, under a written 6-month warranty. For the full fault reference, see the dishwasher repair guide.
Frequently asked questions
A dishwasher with no display — how do I read the code?
Models without a display say the same AL codes through flashing lights: a light blinks a fixed number of times then pauses, and that number is the code (3 blinks = AL03 usually). Count the blinks over two cycles to confirm, and send the number with the model on WhatsApp and we'll tell you the code and its meaning.
What's the most dangerous code on Ariston dishwashers?
AL01 — it means the Aqua Stop system sensed a water leak in the base of the dishwasher and shut off the water to protect your kitchen. Don't try to run it again or tilt it to drain the sensor: the leak is still there. Close the tap, unplug, and call — the leak source must be fixed before any operation.
What's the most common code? And is it solved at home?
AL03 (a drainage problem) is the most common — and its first cause is bottom filters blocked with food debris. Clean the filters under running water, check the drain hose for kinks and try a short program — it's solved at home in most cases. Persisting = the drain pump or the sensor.
The code appears and disappears — should I worry or wait?
Worry — an intermittent code means a fault in its early stage: a partial blockage growing, a sensor glitching, or a half-intact connection. Dealing with it now is cheaper and faster than waiting for the full stop, especially if it's AL01 (a leak) — that specifically must never be ignored even if it appears once.
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