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Error code reference

Dacor Range Oven Cooktop Error Code F3

Classic Dishwasher 30": Controller failure to communicate with the power board

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Classic Dishwasher 30": Controller failure to communicate with the power board - F3 flashes on display, dishwasher disabled.

First step from the service manual

Check control and power board compatibility and wire harness between the two; replace control and power boards if problem persists.

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

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What F3 means on a Dacor range oven cooktop

The F3 error code on a Dacor Classic 30" dishwasher indicates a communication failure between the control board (the user interface and logic controller) and the power board (the component responsible for supplying and managing electrical power to the dishwasher's operating systems). When this communication link breaks down, the dishwasher's control system cannot confirm that power delivery is functioning correctly, and the unit disables itself as a safety measure. The F3 code will flash on the display and the machine will not operate until the fault is resolved.

The most common root causes fall into three categories: incompatible board pairing, a damaged or disconnected wire harness, or a failed board. The wire harness connecting the two boards carries the data and power signals that allow them to communicate. If any connector is loose, corroded, or has sustained physical damage, the communication signal can be interrupted or lost entirely. Similarly, if a control or power board has been replaced with an incompatible part, the two boards may not be able to establish the expected communication protocol.

Diagnosis should begin with a physical inspection of the wire harness between the control board and power board, checking for loose connectors, broken wires, or signs of heat damage or corrosion. Board compatibility should also be confirmed, particularly if either board has been previously replaced. If the harness is intact and the boards are confirmed compatible but the error persists, one or both boards have likely failed internally and will need replacement to restore operation.

Source: manufacturer service documentation.

Common causes of F3

  1. 01

    Loose or disconnected wire harness

    Wiring / connection

    The wire harness linking the control board and power board may have a connector that has worked loose or become unplugged. Inspect the harness at both ends for secure seating.

  2. 02

    Damaged wire harness

    Part replacement

    Wires in the harness between the two boards may be broken, pinched, or corroded, preventing communication signals from passing through. A visual inspection and continuity check will help identify damaged sections.

  3. 03

    Incompatible control and power board pairing

    Part replacement

    If either board has been previously replaced with a non-matching part, the two boards may not be able to communicate with each other. Verify that both boards are compatible with each other and with the specific dishwasher model.

  4. 04

    Failed control board

    Part replacement

    The control board itself may have failed internally, losing the ability to send or receive communication signals to the power board. If the harness and compatibility check out, the control board should be tested and replaced if faulty.

  5. 05

    Failed power board

    Part replacement

    The power board may have failed, preventing it from responding to communication from the control board. If the control board has been ruled out, the power board is the next component to test and replace.

See the test procedure for each cause

Frequently asked questions about F3

What does F3 mean on a Dacor range, oven, cooktop?
On a Dacor Classic 30" dishwasher, F3 indicates a communication failure between the control board and the power board. The dishwasher disables itself and flashes F3 on the display when this link is broken. The cause can be a faulty wire harness, incompatible boards, or a failed board. A technician will need to inspect the harness and boards to diagnose the issue.
Can I fix the F3 error on my Dacor dishwasher myself?
A basic inspection of the wire harness connectors between the control and power boards is something a confident DIYer can attempt after disconnecting power to the unit. However, diagnosing board compatibility or a failed board typically requires technical knowledge and access to the correct replacement parts. If the harness appears intact, professional service is recommended to avoid purchasing unnecessary components.
Will resetting my Dacor dishwasher clear the F3 error?
A power reset may temporarily clear the display, but the F3 error will return if the underlying communication fault between the control board and power board has not been repaired. A reset does not fix a damaged harness or a failed board. The dishwasher will continue to disable itself until the root cause is addressed.
Is it safe to use my Dacor dishwasher while the F3 error is displayed?
When the F3 code is active, the dishwasher disables itself and will not operate, so running a cycle is not possible until the fault is cleared. This shutdown behavior is a built-in protection measure. You should not attempt to bypass the error, and the unit should be serviced before returning it to use.
How much does it cost to repair an F3 error on a Dacor dishwasher?
Repair costs vary depending on what component has failed. If only the wire harness needs replacement or reseating, costs are generally lower, typically in the range of $75 to $200 for parts and labor. Replacing one or both boards is more expensive, with total repair costs potentially ranging from $200 to $500 or more depending on parts pricing and labor rates in your area.

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