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Error code reference

Viking Dishwasher Error Code 2-3

User Interface

Viking codesViking dishwasher codes

User Interface - Main Control Communication Error - user interface is unable to successfully communicate with the main control.

First step from the service manual

Check wires disconnected between main control and user interface.

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

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What 2-3 means on a Viking dishwasher

Error code 2-3 on a Viking dishwasher indicates a communication failure between the user interface board and the main control board. These two boards exchange data continuously during operation, and when the main control stops receiving valid signals from the user interface (or vice versa), the dishwasher halts and stores this fault code. The communication link between these boards typically runs through a wiring harness with a multi-pin connector on each end, and any disruption along that path will trigger this error.

The most common root causes are physical in nature: loose connectors, broken wires, or terminals that have backed out of their connector housing. Corrosion or moisture intrusion at the connector pins can also degrade the signal enough to cause intermittent or complete communication loss. In less frequent cases, one of the two boards has failed internally and can no longer maintain the communication protocol. Because the error specifically identifies a communication fault rather than a board fault outright, wiring and connectors should always be inspected thoroughly before replacing any components.

Source: manufacturer service documentation.

Common causes of 2-3

  1. 01

    Disconnected or loose wiring harness

    Wiring / connection

    The connector linking the user interface to the main control board may have worked loose from vibration or handling. Check both ends of the harness for connectors that are not fully seated.

  2. 02

    Damaged or broken wire

    Part replacement

    Individual wires in the harness can fray, pinch, or break, especially near connector ends where flex stress is highest. Visually inspect the full length of the wiring and check for continuity with a multimeter.

  3. 03

    Corroded or contaminated connector pins

    Wiring / connection

    Moisture exposure inside the door can cause oxidation on the connector pins, increasing resistance and disrupting the communication signal. Look for green or white deposits on the pins and clean or replace the connector if found.

  4. 04

    Failed user interface board

    Part replacement

    If the wiring checks out, the user interface board itself may have failed and can no longer send a valid signal to the main control. This requires board replacement.

  5. 05

    Failed main control board

    Part replacement

    The main control board may have lost the ability to receive or interpret the signal from the user interface. This is typically diagnosed only after the wiring and user interface board have been ruled out.

See the test procedure for each cause

Frequently asked questions about 2-3

What does 2-3 mean on a Viking dishwasher?
Error code 2-3 means the user interface board and the main control board have lost communication with each other. The dishwasher cannot operate safely without this link, so it shuts down and displays the code. The fault is usually caused by a loose connector, a broken wire, or a failed board.
Can I fix error code 2-3 on my Viking dishwasher myself?
If you are comfortable working around appliance wiring, you can start by checking the wiring harness that connects the user interface to the main control board. Reseating loose connectors or cleaning corroded pins requires no special tools and may resolve the issue. If the wiring is intact, board replacement is typically a job for a qualified technician.
Will resetting my Viking dishwasher clear the 2-3 error code?
A reset may temporarily clear the code, but if the underlying wiring or component problem is not corrected, the error will return as soon as the dishwasher attempts to operate again. A reset is useful for confirming whether the fault is intermittent, but it is not a repair.
Is it safe to use my Viking dishwasher while error code 2-3 is displayed?
No. When this code is active, the dishwasher has disabled itself because the control boards cannot communicate. Attempting to force operation is not recommended. The appliance should remain off until the fault is diagnosed and corrected.
How much does it cost to repair a Viking dishwasher showing error code 2-3?
If the issue is simply a loose connector, the repair may cost nothing beyond a service call fee, which typically ranges from $75 to $150. If a board replacement is needed, parts alone can range from $100 to $400 or more depending on which board has failed, with total repair costs including labor potentially reaching $300 to $600 or higher.

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