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Error code reference

Fisher & Paykel Dishwasher Error Code A09

Sanitize cycle has not met the required wash temperature to sanitize the dishes.

Fisher & Paykel codesFisher & Paykel dishwasher codes

Sanitize cycle has not met the required wash temperature to sanitize the dishes.

First step from the service manual

Check the water supply has not been turned off or the cycle interrupted.

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

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What A09 means on a Fisher & Paykel dishwasher

The A09 error code on a Fisher & Paykel dishwasher indicates that the sanitize cycle failed to reach or maintain the minimum wash temperature required to properly sanitize dishes. Sanitize cycles are designed to heat water to a precise elevated temperature, typically meeting NSF/ANSI Standard 184 requirements, which demand that the final rinse water reach at least 150°F (66°C) to eliminate harmful bacteria. When the dishwasher's control system detects that this thermal threshold was not achieved within the expected time frame, it triggers the A09 fault and flags the cycle as incomplete.

The primary components involved in this error are the water heating element, the wash temperature thermistor or thermostat, and the incoming water supply system. If the incoming water temperature is too low, or if water supply pressure drops mid-cycle, the heater may not be able to bring the wash water up to the required sanitize temperature in time. Similarly, a failing heating element or a faulty temperature sensor that misreads the actual water temperature can both trigger this code.

Before assuming a component failure, the first diagnostic step is to confirm that the water supply valve is fully open and that the cycle was not interrupted by a power fluctuation or user action. Interrupting a sanitize cycle, even briefly, can prevent the unit from logging a successful sanitize completion. If the supply and cycle continuity check out, further diagnosis should focus on the heating element resistance and the accuracy of the temperature sensing circuit.

Source: manufacturer service documentation.

Common causes of A09

  1. 01

    Interrupted or cancelled cycle

    Wiring / connection

    If the sanitize cycle was paused, interrupted by a power blip, or cancelled before completion, the dishwasher cannot confirm the required temperature was reached. Restart a full sanitize cycle without interruption to see if the error clears.

  2. 02

    Low incoming water temperature

    Wiring / connection

    If the hot water supply to the dishwasher is not adequately hot, the heating element alone may not be able to reach sanitize temperatures within the allotted cycle time. Run the hot water tap at the kitchen sink before starting the cycle to confirm hot water is present at the inlet.

  3. 03

    Water supply valve restricted or closed

    Wiring / connection

    A partially closed or restricted supply valve can reduce water flow and pressure, affecting the dishwasher's ability to fill correctly and heat efficiently. Check that the inlet valve under the sink is fully open and that the supply line is not kinked.

  4. 04

    Faulty heating element

    Part replacement

    A heating element that has failed or is underperforming will prevent the wash water from reaching the sanitize temperature threshold. A failing element may show visible damage or measure outside its expected resistance range when tested with a multimeter.

  5. 05

    Defective temperature sensor or thermostat

    Part replacement

    If the thermistor or thermostat is providing inaccurate readings to the control board, the dishwasher may cut off heating prematurely or log a temperature failure even when the element is working. Testing the sensor's resistance output against expected values will help confirm this fault.

See the test procedure for each cause

Frequently asked questions about A09

What does A09 mean on a Fisher & Paykel dishwasher?
The A09 code means the sanitize cycle did not reach the minimum water temperature required to sanitize dishes. Fisher & Paykel dishwashers monitor wash temperature throughout the sanitize cycle and log this fault if the thermal target is not met. The cycle is considered incomplete, and dishes should not be treated as sanitized. The issue can stem from supply problems, an interrupted cycle, or a faulty heating component.
How do I fix the A09 error on my Fisher & Paykel dishwasher?
Start by confirming the water supply valve is fully open and that the cycle was not interrupted. Run the hot water at your kitchen sink for a minute before starting the dishwasher to ensure hot water is present at the inlet, then run a full sanitize cycle again without opening the door. If the error returns after a complete uninterrupted cycle, further diagnosis of the heating element and temperature sensor is needed.
Will resetting the dishwasher clear the A09 error?
A reset may clear the displayed error code, but it will not resolve the underlying cause if there is a component fault. If the problem is simply an interrupted cycle or a temporary supply issue, restarting and completing a full sanitize cycle should clear the code. If the root cause is a failed heating element or sensor, the error will return on the next sanitize cycle.
Is it safe to use my dishwasher with an A09 error?
The A09 error specifically means the sanitize function did not perform correctly, so dishes run during that cycle should not be considered sanitized. Standard wash cycles are not affected in the same way, but you should confirm your dishwasher is functioning normally before relying on it. If a component like the heating element has failed, other cycle temperatures may also be impacted.
How much does it cost to repair an A09 error on a Fisher & Paykel dishwasher?
Repair costs vary depending on the cause. If the issue is simply a supply or cycle problem, there may be no parts cost at all. Replacing a heating element typically runs between $100 and $250 including parts and labor, while a temperature sensor replacement usually falls in the $80 to $180 range. Diagnostic service calls from a qualified technician generally add $75 to $150 before parts.

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