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Error code reference

Ariston Dishwasher Error Code AL 09

Software setup/recognition error

Ariston codesAriston dishwasher codes

Software setup/recognition error - the type of software is not recognized in EEPROM, or wrong keypad connected.

First step from the service manual

Check timer programming; verify correct keypad/interface card is connected.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What AL 09 means on a Ariston dishwasher

AL 09 on an Ariston dishwasher indicates a software setup or recognition error originating in the control system. Specifically, the main control board cannot identify or validate the software type stored in the EEPROM (Electrically Erasable Programmable Read-Only Memory). The EEPROM holds configuration data that tells the control board what type of appliance it is managing, which software version to run, and how to interpret signals from the keypad and other components. When this data is absent, corrupted, or incompatible with the connected hardware, the board halts normal operation and triggers AL 09.

A secondary cause involves a mismatched or incorrectly connected keypad and interface card. The control board performs a recognition handshake with the user interface at startup. If the keypad model does not match what the EEPROM configuration expects, or if the interface card is improperly seated or from a different appliance variant, the board cannot complete this check and throws the AL 09 fault. This can occur after a component replacement where a non-compatible part was installed.

Diagnosis begins with verifying the timer programming and confirming that the keypad and interface card connected to the control board are the correct units for this specific Ariston model. A corrupted EEPROM may require reprogramming or replacement of the control board itself. Technicians should also inspect all ribbon cable and connector seating between the interface card and the main board, as intermittent contact can produce the same recognition failure.

Source: manufacturer service documentation.

Common causes of AL 09

  1. 01

    Corrupted or blank EEPROM

    Part replacement

    The EEPROM on the control board may have lost its configuration data due to a power surge or component aging. This prevents the board from identifying the correct software type, triggering AL 09 immediately on startup.

  2. 02

    Incorrect or incompatible keypad connected

    Part replacement

    If the keypad or user interface card was recently replaced with a unit intended for a different Ariston model or variant, the control board will fail the recognition check. Confirm the part number matches the specific appliance model.

  3. 03

    Improperly seated interface card or ribbon cable

    Wiring / connection

    A loose or partially disconnected ribbon cable between the keypad interface and the main control board can interrupt communication, causing the board to report a recognition failure. Inspect and reseat all connectors firmly.

  4. 04

    Incorrect timer programming

    Wiring / connection

    The control board timer may not have been programmed correctly for the appliance configuration, leaving the software setup incomplete. This is checked early in diagnosis by reviewing the timer parameters against the correct specification for the model.

  5. 05

    Failed main control board

    Part replacement

    If the EEPROM data cannot be restored through reprogramming and all connected components are verified as correct, the control board itself may have failed and require replacement.

See the test procedure for each cause

Frequently asked questions about AL 09

What does AL 09 mean on a Ariston dishwasher?
AL 09 indicates a software setup or recognition error. The control board cannot identify the software type stored in the EEPROM, or it has detected that an unrecognized or incompatible keypad is connected. The dishwasher will not operate normally until the mismatch or data issue is resolved.
Can I fix AL 09 myself or do I need a technician?
Some causes, such as a loose ribbon cable or interface card connector, can be checked by a confident DIYer comfortable working with electronics. However, issues involving EEPROM reprogramming or control board replacement require technical expertise. If a recent part replacement triggered the error, start by confirming the replacement part is the correct one for your exact model.
Will resetting the dishwasher clear the AL 09 error?
A power reset may temporarily clear the error display, but AL 09 will return if the underlying cause is not addressed. If the EEPROM data is corrupted or the wrong keypad is connected, the fault will reappear each time the dishwasher powers on. A reset alone is not a fix for this code.
Is it safe to use my Ariston dishwasher while AL 09 is showing?
No. AL 09 prevents the control board from operating correctly, and the dishwasher should not be run while this error is active. Attempting to force operation could result in incomplete cycles or potential damage to other components. Resolve the fault before resuming use.
How much does it cost to repair an AL 09 error on an Ariston dishwasher?
Repair costs depend on the root cause. If only a connector needs reseating, the cost is primarily labor, typically in the range of $75 to $150 for a service call. If the control board requires reprogramming or replacement, or if a new keypad interface card is needed, total costs including parts and labor can range from $150 to $400 or more depending on parts availability and local labor rates.

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