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Error code reference

Viking Dishwasher Error Code 5-5

Internal error

Viking codesViking dishwasher codes

Internal error – main control or UI detects a board level failure.

First step from the service manual

Check for defective main control, defective wire harness, or defective user interface.

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

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What 5-5 means on a Viking dishwasher

Error code 5-5 on a Viking dishwasher indicates an internal board-level failure detected by either the main control board or the user interface (UI) board. This code signals that one or both of these electronic assemblies has experienced a hardware fault it cannot recover from through normal operation. Unlike sensor-related faults that point to external components, a 5-5 code originates within the control electronics themselves, meaning the problem typically lies in the circuitry, firmware, or communication pathways between boards.

The main control board is the central processing unit of the dishwasher, responsible for managing wash cycles, motor operation, heating, and water inlet functions. The user interface board handles input commands and display output, communicating with the main control via a dedicated wire harness. When either board detects a fault in this internal communication loop or within its own circuitry, it throws a 5-5 code to alert the technician that the electronics require inspection.

Common root causes include a failed main control board, a failed UI board, or a damaged wire harness connecting the two. Harness issues such as corroded pins, loose connectors, or broken wires can interrupt board-to-board communication and mimic a true board failure. Diagnosis should start by inspecting the wire harness for visible damage before condemning either board, as harness replacement is significantly less costly than control board replacement.

Source: manufacturer service documentation.

Common causes of 5-5

  1. 01

    Defective main control board

    Part replacement

    The main control board has experienced an internal circuit failure and can no longer operate correctly. Signs include the dishwasher failing to start, freezing mid-cycle, or displaying the 5-5 code immediately on power-up.

  2. 02

    Damaged or faulty wire harness

    Part replacement

    The wire harness connecting the main control board to the user interface board may have corroded terminals, broken wires, or loose connectors that interrupt communication between the boards. Inspect the harness carefully before replacing any boards.

  3. 03

    Defective user interface board

    Part replacement

    The UI board handles all front-panel input and communicates cycle selections to the main control. A failed UI board can trigger a 5-5 code if it loses the ability to communicate with the main control or develops an internal fault.

  4. 04

    Intermittent power supply issue

    Wiring / connection

    Voltage fluctuations or an unstable power supply to the control boards can cause transient board-level faults that register as a 5-5 error. Verify the dishwasher is receiving stable, properly grounded power before proceeding with board diagnosis.

See the test procedure for each cause

Frequently asked questions about 5-5

What does 5-5 mean on a Viking dishwasher?
The 5-5 code on a Viking dishwasher indicates an internal board-level failure detected by the main control board or the user interface board. It means the electronic control system has identified a hardware fault it cannot self-correct. The fault may be in the main control board, the UI board, or the wire harness connecting the two. A technician should inspect all three components to determine which is at fault.
Can I fix a Viking dishwasher 5-5 error code myself?
A knowledgeable DIYer can start by inspecting the wire harness between the main control board and the user interface board for loose connectors, corrosion, or broken wires, as these are the least expensive repairs. However, if the harness checks out, the fault likely lies in one of the control boards, and replacing these components requires familiarity with appliance electronics and safe handling of circuit boards. If you are not comfortable working with control board assemblies, a qualified technician is recommended.
Is it safe to use my Viking dishwasher when it shows a 5-5 error?
It is generally not advisable to continue operating the dishwasher while a 5-5 error is active. A board-level failure means the control system is not functioning reliably, which could result in improper cycle execution, failure to stop water fill, or other unpredictable behavior. Discontinue use until the faulty component has been identified and replaced.
Will resetting my Viking dishwasher clear the 5-5 error code?
A power reset, performed by cutting power to the unit at the breaker for several minutes, may temporarily clear the 5-5 code if the fault was caused by a transient power event. However, if the underlying cause is a defective main control board, UI board, or damaged wire harness, the code will return. A reset alone does not fix a hardware fault and should be treated as a preliminary step, not a solution.
How much does it cost to repair a Viking dishwasher with a 5-5 error code?
Repair costs depend on which component has failed. A wire harness replacement is the least expensive repair, typically falling in the range of $50 to $150 for parts and labor. Main control board or user interface board replacements are more costly, with parts and labor potentially ranging from $200 to $500 or more depending on part availability and local labor rates. Diagnosing the exact failed component first will help avoid unnecessary parts replacement.

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