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Error code reference

Fisher & Paykel Dishwasher Error Code EC

Communications error between the mains filter board and controllers.

Fisher & Paykel codesFisher & Paykel dishwasher codes

Communications error between the mains filter board and controllers.

First step from the service manual

Check the harness connections between the mains filter board and both controllers for signs of any water damage, corrosion or arcing.

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

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What EC means on a Fisher & Paykel dishwasher

The EC error code on a Fisher & Paykel dishwasher indicates a communications failure between the mains filter board and one or both of the machine's controllers. The mains filter board serves as the primary electrical interface, conditioning incoming power and passing signals between control modules. When the communication link between this board and the controllers breaks down, the dishwasher cannot coordinate its operating functions and will halt to prevent unsafe or erratic operation.

The most common root cause of this error is physical damage to the wiring harness that connects these components. Water ingress is a particular concern in dishwashers, as steam and moisture can reach internal electrical connections over time. Corrosion on connector pins, arcing damage from a short circuit, or loose harness connections can all interrupt the signal pathway and trigger the EC code. This is why the first diagnostic step focuses on a thorough visual inspection of those harness connections.

Beyond wiring issues, a failed mains filter board or a faulty controller can also produce this error if the hardware itself is no longer capable of maintaining communication. However, component failure is typically a secondary consideration after ruling out connection and wiring problems, since harness and connector issues are far more common and straightforward to address.

Source: manufacturer service documentation.

Common causes of EC

  1. 01

    Corroded or damaged harness connectors

    Wiring / connection

    Moisture and steam inside the dishwasher can corrode the connector pins on the harness linking the mains filter board to the controllers. Inspect the connectors for green or white corrosion buildup, which will disrupt the electrical signal.

  2. 02

    Water damage to the wiring harness

    Part replacement

    A leak or excessive condensation can allow water to contact the harness, causing shorts or open circuits in the communication wiring. Look for water staining, discoloration, or brittle insulation along the harness length.

  3. 03

    Loose or disconnected harness connection

    Wiring / connection

    Vibration during normal operation can cause connectors to work loose from the mains filter board or controller ports. Check that all harness plugs are fully seated and locked into their receptacles.

  4. 04

    Arcing damage at connector points

    Part replacement

    A partial short circuit can cause arcing at connector terminals, burning or melting the plastic housing and destroying the contact surface. Visually inspect connectors for scorch marks or melted plastic.

  5. 05

    Failed mains filter board or controller

    Part replacement

    If the harness and connectors are in good condition, the mains filter board or one of the controllers may have failed internally and can no longer maintain communication. Component-level testing or replacement is required to confirm this.

See the test procedure for each cause

Frequently asked questions about EC

What does EC mean on a Fisher & Paykel dishwasher?
The EC code indicates a communications error between the mains filter board and the dishwasher's controllers. This means the internal circuit boards can no longer exchange signals properly, so the machine stops operating. The error is most often caused by damaged, corroded, or loose wiring harness connections between these components.
Can I fix the EC error on my Fisher & Paykel dishwasher myself?
A knowledgeable DIYer can begin by inspecting the harness connections between the mains filter board and controllers for corrosion, arcing, or loose plugs, and reseating or cleaning any affected connectors. If the wiring or connectors are physically damaged, replacing the harness is a more involved repair. If both the wiring and connectors look intact, diagnosing a failed board or controller typically requires a technician with component-level testing tools.
Will resetting my Fisher & Paykel dishwasher clear the EC error?
A power reset may temporarily clear the EC code if it was triggered by a transient communication glitch, but the error will return if an underlying wiring or component fault is present. Turning the dishwasher off at the wall for a few minutes and restarting is worth trying, but a persistent EC code requires physical inspection of the harness and connections to find the root cause.
Is it safe to use my dishwasher when the EC error is showing?
You should not continue running the dishwasher while the EC code is active. A communications failure between the mains filter board and controllers means the machine cannot properly coordinate its functions, and the error may be associated with wiring damage that could pose an electrical risk. Leave the dishwasher powered off until the fault is diagnosed and repaired.
How much does it cost to repair the EC error on a Fisher & Paykel dishwasher?
Repair costs vary depending on the cause. If the fix is simply cleaning or reseating corroded connectors, the cost may be limited to a service call fee, typically in the range of $80 to $150. Replacing a damaged wiring harness or a faulty mains filter board or controller can bring the total repair cost to anywhere from $150 to $400 or more, depending on parts pricing and labor rates in your area.

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