Ariston Dishwasher Error Code AL 12

AL 12 is a hardware version alarm indicating that the Bit100 timer module does not recognize the user interface card connected to it. The Bit100 expects a specific LED, LCD, or graphics interface card version, and when the connected card does not match, the alarm is triggered. The dishwasher will not operate until the correct, compatible interface card is confirmed to be properly connected.

A simple power reset is unlikely to permanently clear AL 12 because the alarm is tied to a hardware recognition failure that reoccurs every time the Bit100 attempts to communicate with the interface card. The underlying mismatch or connection fault must be corrected first. Once the correct, compatible interface card is properly connected, the alarm should not return.

If the fix is simply reseating a loose connector, there may be no parts cost at all, though a technician call-out fee would still apply, typically in the range of $75 to $150 depending on your location. Replacing a faulty interface card generally costs between $80 and $200 for the part, plus labor. If the Bit100 timer module itself needs replacement, parts and labor combined could range from $150 to $350 or more, making it worth comparing repair costs against the age and value of the appliance.

Start by verifying that the correct interface card type is connected to the Bit100 timer, confirming it matches the LED, LCD, or graphics specification for your model. Next, inspect the connector and ribbon cable between the interface card and the Bit100 for loose connections, corrosion, or damaged pins, and reseat all connectors firmly. If the connection is secure and the card type is correct but the error persists, the interface card or the Bit100 timer may need to be replaced.

The dishwasher will typically prevent normal operation when AL 12 is active, so running a wash cycle is not generally possible while the alarm is present. There is no immediate safety hazard to the home from this error, as it is a communication and compatibility fault rather than a water or electrical danger. However, the appliance should not be used until the fault is resolved to avoid potential secondary issues.