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Error code reference

Fisher & Paykel Dishwasher Error Code F1

The flood switch has been activated, indicating a water leak in the base of the dishwasher, a fill valve…

Fisher & Paykel codesFisher & Paykel dishwasher codes

The flood switch has been activated, indicating a water leak in the base of the dishwasher, a fill valve failed open, a faulty flood switch, or excessive water added to a wash sub cycle indicating leaking seal or siphoning.

First step from the service manual

Check if water overflows through the back air vent; if yes, check spray arm for split or water deflection; if no, check if a flood occurred and activated the flood switch.

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

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What F1 means on a Fisher & Paykel dishwasher

The F1 error code on a Fisher & Paykel dishwasher indicates that the flood switch has been activated. This switch is located in the base pan of the dishwasher and is designed to detect water that has escaped from the main tub or internal components. When water accumulates in the base, it triggers the float-style flood switch, which signals the control board to halt operation and display F1. The purpose of this safety mechanism is to prevent water damage to the surrounding cabinetry and flooring.

There are several possible causes for F1 activation. A fill valve that has failed in the open position will continuously allow water to enter the tub, eventually overflowing into the base. A leaking door seal or internal hose connection can allow water to drip into the base pan during cycles. Siphoning conditions, where water is drawn back into the machine during certain sub cycles, can also result in excessive water accumulation. A split or misaligned spray arm can deflect water toward the rear vent and into the base cavity rather than keeping it within the wash zone.

In some cases, the flood switch itself may be faulty and triggering F1 without an actual leak present. The first diagnostic step is to check whether water is visibly overflowing through the back air vent. If overflow is present, inspect the spray arms for cracks or damage that could be redirecting water. If there is no visible overflow but the error persists, confirm whether actual water is present in the base pan before assuming a switch fault. Addressing the root cause of water intrusion is necessary before the machine will return to normal operation.

Source: manufacturer service documentation.

Common causes of F1

  1. 01

    Water leak in the base pan

    Part replacement

    A loose hose connection, cracked internal component, or failed door seal can allow water to drip into the base during operation, accumulating until the flood switch activates. Inspect the base pan for visible pooling after removing the lower access panel.

  2. 02

    Fill valve failed in the open position

    Part replacement

    If the fill valve fails to close, water continuously enters the tub and eventually overflows into the base pan. This condition often occurs even when the dishwasher is not running a cycle.

  3. 03

    Damaged or misaligned spray arm

    Part replacement

    A split, cracked, or incorrectly seated spray arm can deflect water toward the back air vent and into the base cavity instead of circulating it within the wash zone. Check the spray arms for visible cracks and confirm they are properly attached.

  4. 04

    Leaking seal or siphoning condition

    Part replacement

    A degraded tub seal or drain hose siphoning issue can cause excessive water to accumulate during a wash sub cycle, eventually reaching the flood switch. Siphoning typically points to an improperly installed or routed drain hose.

  5. 05

    Faulty flood switch

    Part replacement

    The flood switch itself may be defective and triggering F1 without any actual water present in the base. This should be considered only after confirming the base pan is dry and no other source of water intrusion has been found.

See the test procedure for each cause

Frequently asked questions about F1

What does F1 mean on a Fisher & Paykel dishwasher?
F1 indicates that the flood switch in the base of the dishwasher has been activated. This switch detects water that has escaped into the base pan beneath the main tub. The error stops the machine to prevent further water damage. Common causes include a failed fill valve, leaking seals, a damaged spray arm, or in some cases a faulty flood switch.
How do I fix the F1 error on my Fisher & Paykel dishwasher?
Start by checking whether water is overflowing through the back air vent, which would point to a spray arm issue. Next, check the base pan for actual water accumulation and identify the source, such as a leaking hose, failed door seal, or stuck-open fill valve. The water in the base pan must be removed and the underlying cause repaired before the machine will clear the error. If the base pan is dry and the error persists, the flood switch itself may need to be tested or replaced.
Is it safe to keep using my dishwasher when the F1 error is showing?
No, you should not continue running the dishwasher while F1 is active. The error indicates that water has reached an area where it can cause damage to your flooring, cabinetry, or the dishwasher's electrical components. The machine will typically halt operation automatically as a safety measure, and running it again before the issue is resolved could worsen the damage.
Will resetting the dishwasher clear the F1 error?
A reset may temporarily clear the error code display, but F1 will return if the underlying cause has not been addressed. If water remains in the base pan or the component causing the leak has not been repaired, the flood switch will activate again as soon as the machine runs. Always resolve the root cause before attempting to reset and resume normal operation.
How much does it cost to repair an F1 error on a Fisher & Paykel dishwasher?
Repair costs vary depending on the root cause. Replacing a fill valve or flood switch typically falls in the range of $80 to $200 including parts and labor. A door seal replacement is generally in the $60 to $150 range. If the repair requires a service technician to diagnose and address multiple components, total costs could be higher. Getting a diagnostic assessment first is the best way to understand the scope of the repair.

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