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Error code reference

Ariston Dishwasher Error Code AL 10

Heating element circuit not compliant

Ariston codesAriston dishwasher codes

Heating element circuit not compliant - timer detects heating element circuit open for 9 seconds after pressure switch contacts close; also covers heating element relay open.

First step from the service manual

Check heating element circuit cables, timer relay, heating element ITR calibration; check for disconnected cables on timer or heating element.

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

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What AL 10 means on a Ariston dishwasher

The AL 10 error code on an Ariston dishwasher indicates a heating element circuit fault. Specifically, the timer detects that the heating element circuit remains open for 9 seconds or longer after the pressure switch contacts have closed. The pressure switch closing signals that sufficient water is present in the tub to allow heating to begin. If the heating circuit does not respond and complete within that 9-second window, the control logic flags the fault. This code also covers a condition where the heating element relay itself is found to be open, meaning the relay that should energize the heating element is not functioning correctly.

The heating element circuit in this context includes the element itself, the wiring harness connecting it to the timer and relay, and the relay contacts on the timer board. A break anywhere in this circuit, including a disconnected terminal, corroded connector, or failed relay, will prevent current from reaching the element. The ITR (Integrated Thermal Relay or calibration reference) for the heating element is also part of the diagnostic scope, meaning the thermal protection or calibration component associated with the element may be out of specification or failed.

Common triggers include loose or disconnected wiring at either the timer board or the heating element terminals, an open heating element that has burned through internally, or a failed relay on the timer. Physical inspection of all connectors along the heating circuit is the recommended starting point, followed by continuity testing of the element and relay contacts.

Source: manufacturer service documentation.

Common causes of AL 10

  1. 01

    Disconnected or loose wiring

    Wiring / connection

    A disconnected terminal or loose cable at either the timer board or the heating element is a leading cause of AL 10. Inspect all connectors along the heating circuit for signs of pulling, corrosion, or poor seating.

  2. 02

    Failed heating element

    Part replacement

    The heating element itself may have developed an open circuit internally, preventing current flow. This can be confirmed with a continuity test across the element terminals.

  3. 03

    Open heating element relay on the timer

    Part replacement

    The relay on the timer board that controls power to the heating element may have failed in the open position. If the relay contacts do not close when commanded, the circuit remains open and AL 10 is triggered.

  4. 04

    Heating element ITR calibration issue

    Part replacement

    The thermal protection or ITR component associated with the heating element may be out of calibration or faulty, causing the circuit to appear open to the timer even if the element itself is intact.

  5. 05

    Pressure switch wiring or contact fault

    Wiring / connection

    If the pressure switch contacts are not closing properly, the timer may not receive the signal it needs to confirm water is present, causing it to log the heating circuit as non-compliant. Check pressure switch wiring and contact function.

See the test procedure for each cause

Frequently asked questions about AL 10

What does AL 10 mean on a Ariston dishwasher?
AL 10 means the dishwasher timer has detected an open heating element circuit. After the pressure switch confirms water is present, the timer expects the heating circuit to complete within 9 seconds. If it does not, or if the heating element relay is found open, the AL 10 code is set. The fault can involve the wiring, the element itself, or the relay on the timer board.
Can I fix AL 10 on my Ariston dishwasher myself?
Some causes of AL 10, such as a disconnected wire or a loose terminal at the heating element or timer, can be found and corrected by a confident DIYer with basic electrical knowledge. However, testing relay contacts on the timer board and replacing a faulty heating element require working safely around mains-voltage components. If you are not comfortable working with live appliance circuits, a qualified technician should perform the diagnosis.
Is it safe to keep using my dishwasher with an AL 10 error?
You should not continue running the dishwasher with AL 10 active. The code indicates a break in the heating circuit, which means your dishes will not be properly sanitized and the machine has already halted the cycle for protection. Running repeated cycles without addressing the fault is unlikely to resolve anything and could mask a more serious wiring issue.
Will resetting my Ariston dishwasher clear the AL 10 error?
A power reset may clear the displayed code temporarily, but if the underlying fault in the heating element circuit has not been corrected, the code will return as soon as the dishwasher reaches the heating stage of the next cycle. The fault must be diagnosed and the defective component or wiring repaired before the error is fully resolved.
How much does it cost to repair an AL 10 error on an Ariston dishwasher?
Repair costs vary depending on the faulty component. If only a disconnected wire is the issue, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing a heating element generally costs $100 to $250 including parts and labor. A faulty timer board with a failed relay is typically the most expensive repair, often ranging from $150 to $350 or more depending on parts availability.

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