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Error code reference

Dacor Dishwasher Error Code F5

Controller failure to communicate with PIC or no PIC software in the power board PIC Microcontroller.

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Controller failure to communicate with PIC or no PIC software in the power board PIC Microcontroller.

First step from the service manual

Replace power board.

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

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What F5 means on a Dacor dishwasher

The F5 error code on a Dacor dishwasher indicates a communication failure between the main controller and the PIC (Peripheral Interface Controller) microcontroller located on the power board. The PIC microcontroller is responsible for managing core operational logic and interfacing between the control board and the dishwasher's functional components. When the main controller attempts to establish communication with the PIC and receives no response, or when the power board's PIC contains no valid software, the F5 fault is triggered and normal operation is halted.

This fault points directly to the power board as the source of the problem. The two most likely root causes are a hardware failure within the PIC microcontroller itself, or a corrupted or missing firmware load on the PIC. Either condition prevents the controller from successfully completing its initialization handshake with the power board. In some cases, a power surge or interrupted firmware update can leave the PIC in a non-functional state where it is physically present but unable to respond.

Because the diagnostic path leads directly to the power board, there are limited intermediate steps to take before replacement. Inspecting wiring harness connections between the control board and power board for loose or damaged pins is a reasonable first check, but if connections are intact, the power board itself is the failed component. Replacing the power board is the primary and recommended corrective action for this fault code.

Source: manufacturer service documentation.

Common causes of F5

  1. 01

    Failed PIC microcontroller on the power board

    Part replacement

    The PIC microcontroller on the power board has failed due to age, heat stress, or a power surge, preventing any communication with the main controller. This is the most common cause and requires power board replacement.

  2. 02

    Missing or corrupted PIC firmware

    Part replacement

    The power board's PIC microcontroller contains no valid software, either due to a failed programming process during manufacturing or corruption caused by a power event. The controller cannot establish communication with an unprogrammed PIC.

  3. 03

    Loose or damaged wiring harness connection

    Wiring / connection

    A disconnected or damaged connector between the main controller and the power board can simulate a communication failure. Inspect all harness pins at both board connectors for corrosion, looseness, or physical damage before replacing the board.

  4. 04

    Power board damaged by voltage surge

    Part replacement

    An electrical surge can damage the power board circuitry in a way that leaves the PIC unresponsive. If the fault appeared after a power outage or fluctuation, the power board is likely the affected component.

See the test procedure for each cause

Frequently asked questions about F5

What does F5 mean on a Dacor dishwasher?
The F5 error code means the main controller has failed to communicate with the PIC microcontroller on the power board, or the power board's PIC contains no valid software. This is a control system fault that prevents the dishwasher from operating. The fault points directly to the power board as the component requiring attention.
Can I fix the F5 error myself on a Dacor dishwasher?
A knowledgeable DIYer can start by checking and reseating the wiring harness connectors between the main controller and the power board. If connections are intact and secure, the power board itself needs to be replaced, which involves working with the dishwasher's electrical components. If you are not comfortable with appliance electrical work, a qualified technician should perform the repair.
Will resetting my Dacor dishwasher clear the F5 error code?
A power reset is unlikely to permanently clear the F5 error because the fault reflects a hardware or firmware problem with the power board, not a temporary software glitch. The error will typically return as soon as the dishwasher attempts to initialize communication with the PIC microcontroller. A reset is not a substitute for replacing the faulty power board.
Is it safe to use my Dacor dishwasher when the F5 code is displayed?
The dishwasher will not operate normally when the F5 code is active, as the control system cannot communicate with the power board. Attempting to run a cycle in this state is not advisable. The appliance should remain unused until the power board is inspected and replaced as needed.
How much does it cost to repair a Dacor dishwasher with an F5 error?
The cost depends on whether you replace the power board yourself or hire a technician. The power board part alone typically ranges from $150 to $350 depending on the model. Adding professional labor, the total repair cost can range from $250 to $550 or more. Getting a diagnosis from a certified technician first can help confirm the power board is the only failed component before purchasing parts.

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