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Error code reference

Fisher & Paykel Dishwasher Error Code FC3

Inter-wash controller communications fault

Fisher & Paykel codesFisher & Paykel dishwasher codes

Inter-wash controller communications fault - top tub wash controller cannot communicate with the bottom tub wash controller.

First step from the service manual

Check if the bottom tub wash controller harness is damaged or disconnected.

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

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What FC3 means on a Fisher & Paykel dishwasher

The FC3 error code on a Fisher & Paykel dishwasher indicates an inter-wash controller communications fault specific to double-drawer (DishDrawer) models. In these units, each drawer operates as an independent wash tub controlled by its own wash controller. The top tub wash controller acts as the primary communication node and continuously exchanges data with the bottom tub wash controller during operation. When this communication link is disrupted or cannot be established, the FC3 code is triggered.

The communication between the two wash controllers depends on a dedicated wiring harness that connects the bottom tub controller to the top tub controller. If this harness is damaged, pinched, corroded at the connector pins, or has become fully disconnected, the top controller loses visibility of the bottom unit and flags the fault. This type of fault is most commonly introduced after a service visit, a drawer removal, or physical impact that shifts internal components.

Beyond harness integrity, the fault can also point to a failed bottom tub wash controller itself. If the harness checks out as intact and properly connected, the bottom controller board may have suffered a component failure that prevents it from transmitting or receiving communication signals. Diagnosing this accurately requires confirming harness continuity first before condemning the controller board.

Source: manufacturer service documentation.

Common causes of FC3

  1. 01

    Disconnected bottom tub controller harness

    Wiring / connection

    The wiring harness connecting the bottom tub wash controller to the top tub wash controller may have come unplugged. Check the connector at both ends of the harness for secure seating.

  2. 02

    Damaged communication harness

    Part replacement

    The harness itself may be pinched, chafed, or have broken wires internally. Inspect the full length of the harness for visible damage, especially near routing bends or sharp cabinet edges.

  3. 03

    Corroded or contaminated connector pins

    Wiring / connection

    Moisture or detergent residue can cause corrosion on the harness connector pins, increasing resistance and breaking the communication signal. Inspect the connector contacts for discoloration, pitting, or buildup.

  4. 04

    Failed bottom tub wash controller

    Part replacement

    If the harness and connectors are confirmed to be in good condition, the bottom tub wash controller board itself may have failed and is no longer able to communicate. This requires board replacement.

See the test procedure for each cause

Frequently asked questions about FC3

What does FC3 mean on a Fisher & Paykel dishwasher?
FC3 indicates an inter-wash controller communications fault. It means the top drawer's wash controller cannot communicate with the bottom drawer's wash controller. This is specific to Fisher & Paykel DishDrawer models that have two independent tubs. The fault is most often caused by a damaged or disconnected wiring harness between the two controllers.
Can I fix the FC3 error myself?
In some cases, yes. The first step is to check whether the wiring harness connecting the bottom tub wash controller is securely plugged in at both ends. If the connector has simply come loose, reseating it may resolve the fault without any parts. However, if the harness is damaged or the bottom controller board has failed, those repairs are more involved and may require a technician.
Will resetting the dishwasher clear an FC3 error?
A reset may temporarily clear the displayed code, but if the underlying communication fault still exists, the FC3 error will return once the unit attempts to run. A reset is not a fix. The physical cause, whether a loose harness, damaged wiring, or a faulty controller board, must be identified and corrected to permanently clear the fault.
Is it safe to use my Fisher & Paykel dishwasher with an FC3 error?
Operating the dishwasher with an active FC3 fault is not recommended. Because the top controller cannot communicate with the bottom controller, the unit may not complete cycles correctly or may behave unpredictably. It is best to leave the appliance off until the fault is diagnosed and repaired.
How much does it cost to repair an FC3 fault on a Fisher & Paykel dishwasher?
Repair costs vary depending on the cause. If the fix is simply reconnecting a harness, a service call fee of roughly $80 to $150 may be the only cost. If the communication harness needs replacement, parts and labor could bring the total to $150 to $300. A failed bottom tub wash controller board is the most expensive scenario, with total repair costs potentially ranging from $250 to $500 or more depending on parts availability and labor rates in your area.

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