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Error code reference

Fisher & Paykel Dishwasher Error Code Err

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.

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 Err means on a Fisher & Paykel dishwasher

The Err fault code on a Fisher & Paykel dishwasher indicates an inter-wash controller communications fault. This appliance uses a dual-tub architecture where an upper tub wash controller and a lower tub wash controller must communicate continuously during operation. When the top tub controller loses its communication link with the bottom tub controller, the system cannot coordinate wash cycles between the two tubs and triggers this error to prevent unsafe or incomplete operation.

The most direct cause of this fault is a problem with the wiring harness that connects the two controllers. This harness carries the control signals between the boards, and any break, pinched wire, corroded connector, or fully disconnected plug will interrupt that communication path. The first diagnostic step is a physical inspection of the bottom tub wash controller harness, checking for visible damage, loose connectors, or pins that have backed out of their housing.

If the harness is intact and properly seated, the fault may point to a failure in one of the two controllers themselves. A controller with a damaged communication circuit will produce the same symptom as a broken wire, since the signal never completes the round trip between boards. In these cases, the faulty controller must be identified and replaced. Proper diagnosis requires checking whether the harness continuity is confirmed before condemning a controller board.

Source: manufacturer service documentation.

Common causes of Err

  1. 01

    Disconnected bottom tub controller harness

    Wiring / connection

    The harness connecting the bottom tub wash controller may have come unplugged, either during a previous repair or from vibration over time. Inspect the connector at the bottom tub controller for a loose or fully separated plug.

  2. 02

    Damaged wiring harness

    Part replacement

    The harness between the two controllers may have a pinched, frayed, or broken wire, often caused by the harness rubbing against internal components or being caught during servicing. A visual inspection and continuity test will confirm a break.

  3. 03

    Corroded or dirty connector pins

    Wiring / connection

    Moisture inside the appliance can cause corrosion at the harness connector pins, increasing resistance and interrupting the communication signal. Inspect the connector contacts for discoloration, oxidation, or debris.

  4. 04

    Failed bottom tub wash controller

    Part replacement

    If the harness is confirmed intact and properly connected, the bottom tub controller board itself may have a damaged communication circuit. This requires board replacement after ruling out wiring faults.

  5. 05

    Failed top tub wash controller

    Part replacement

    Less commonly, the top tub controller that initiates communication may be the faulty component. If the bottom tub controller and harness both test good, the top board should be evaluated.

See the test procedure for each cause

Frequently asked questions about Err

What does Err mean on a Fisher & Paykel dishwasher?
The Err code indicates an inter-wash controller communications fault, meaning the top tub wash controller has lost communication with the bottom tub wash controller. This is specific to Fisher & Paykel dual-tub dishwasher models that use two separate control boards to manage each tub. The appliance will not run until the communication link is restored. The fault is most often caused by a wiring issue rather than a failed board.
Can I fix the Err code myself?
If the cause is a disconnected harness connector, a confident DIYer can reseat the plug after unplugging the appliance from power. Visually inspect the wiring harness running to the bottom tub controller for obvious damage or a loose connection. If the harness is damaged or the connectors look corroded, or if reseating the plug does not clear the fault, a technician with the ability to test continuity and evaluate control boards will be needed.
Is it safe to use my dishwasher while the Err code is showing?
No, you should not attempt to run the dishwasher while this fault is active. The appliance has detected a failure in the control communication between its two tubs and has halted operation for that reason. Running a dishwasher with a failed controller communication link could result in uncontrolled or incomplete cycle behavior.
Will resetting the dishwasher clear the Err code?
A power reset, such as unplugging the unit or cycling the breaker, may temporarily clear the displayed code, but the fault will return if the underlying wiring or controller problem is not fixed. The Err code is triggered by an active communication failure, so the root cause must be resolved before the appliance will operate normally.
How much does it cost to repair the Err fault on a Fisher & Paykel dishwasher?
If the issue is simply a disconnected harness, the repair may cost nothing beyond a service call fee, which typically ranges from $75 to $150. Harness replacement parts vary but generally fall in the $30 to $80 range before labor. A replacement wash controller board is more expensive, with parts and labor costs often ranging from $200 to $400 or more depending on the specific board required and your location.

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