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Error code reference

Fisher & Paykel Dishwasher Error Code A1

Water supply fault

Fisher & Paykel codesFisher & Paykel dishwasher codes

Water supply fault - the dishwasher is not receiving adequate water supply.

First step from the service manual

Check if the water supply hose is connected and the tap is turned on.

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

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What A1 means on a Fisher & Paykel dishwasher

The A1 error code on a Fisher & Paykel dishwasher indicates a water supply fault, meaning the appliance is not detecting adequate water entering the tub during the fill cycle. The dishwasher's control board monitors the fill process and triggers this fault when it determines that water has not reached the required level within a set time period. This is fundamentally a water intake problem, and the fault points to the supply side of the machine rather than drainage or wash performance.

The components involved in the fill system include the water inlet valve, the water supply hose, the household tap connection, and the water level pressure sensor. If any of these fail or are restricted, the dishwasher cannot confirm a successful fill and will stop the cycle and display A1. The inlet valve is an electrically operated solenoid valve that opens on command from the control board. A failed solenoid, a blocked inlet screen, or insufficient water pressure can all prevent the valve from delivering water at the required flow rate.

The most straightforward causes are often external to the machine itself, such as a closed tap, a kinked supply hose, or low household water pressure. However, if the supply is confirmed to be adequate and the fault persists, the internal inlet valve or the pressure sensor may need to be inspected and tested. Always rule out the simple external causes first before moving to internal component diagnosis.

Source: manufacturer service documentation.

Common causes of A1

  1. 01

    Water tap turned off or partially closed

    Wiring / connection

    The supply tap behind or under the sink must be fully open for the dishwasher to fill correctly. A partially closed tap restricts flow enough to trigger the A1 fault.

  2. 02

    Kinked or blocked supply hose

    Wiring / connection

    If the water supply hose is bent sharply or pinched against the wall or cabinetry, water flow will be restricted. Inspect the full length of the hose for kinks or crushing.

  3. 03

    Blocked inlet valve filter screen

    Wiring / connection

    The water inlet valve includes a small mesh filter screen where the hose connects to the machine. Sediment and mineral deposits can clog this screen over time, reducing water flow to a level that triggers the fault.

  4. 04

    Failed water inlet valve

    Part replacement

    The inlet valve is a solenoid-operated component that opens to let water into the tub. If the solenoid coil has failed or the valve is mechanically stuck closed, no water will enter regardless of supply pressure.

  5. 05

    Faulty water level pressure sensor

    Part replacement

    The pressure sensor monitors how much water is in the tub and reports fill status to the control board. If the sensor is faulty, it may report an insufficient fill even when water is entering normally.

See the test procedure for each cause

Frequently asked questions about A1

What does A1 mean on a Fisher & Paykel dishwasher?
The A1 code indicates a water supply fault, meaning the dishwasher did not receive adequate water during its fill cycle. The control board monitors the fill process and stops the cycle when it cannot confirm that enough water has entered the tub. This can be caused by external supply issues or internal component faults. Start by checking that the water tap is fully open and the supply hose is unobstructed.
How do I fix the A1 error on my Fisher & Paykel dishwasher?
Begin by confirming the water supply tap is fully open and the supply hose is not kinked or crushed behind the machine. Next, disconnect the hose from the inlet valve and check the small filter screen at the connection point for sediment blockage, cleaning it if necessary. If supply and hose are both fine, the water inlet valve or pressure sensor may need to be tested and replaced by a technician.
Is it safe to keep using my dishwasher when it shows an A1 error?
The dishwasher will not operate a wash cycle while the A1 fault is active, so there is no immediate safety risk from the fault itself. You should not attempt to override or bypass the fault. Address the underlying supply issue before running the machine again to avoid any potential for the control board to command components to operate without water present.
Will resetting the dishwasher clear the A1 error code?
Resetting the dishwasher may temporarily clear the displayed code, but the A1 fault will return at the next fill attempt if the underlying cause has not been resolved. A reset is useful to confirm whether the fault was a one-time anomaly, such as a tap that was briefly turned off, but it is not a fix. Correct the water supply issue first, then reset the machine and run a cycle to confirm the fault does not return.
How much does it cost to repair an A1 water supply fault on a Fisher & Paykel dishwasher?
If the fix is simply opening a tap or straightening a kinked hose, there is no cost involved. Cleaning the inlet valve filter screen is also a no-cost repair in most cases. If the water inlet valve itself needs replacement, parts and labor typically range from $150 to $350 depending on your location and the service provider. A faulty pressure sensor repair would fall in a similar cost range.

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