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Error code reference

Viking Dishwasher Error Code AC Power Loss

Power loss occurred during a running cycle.

Viking codesViking dishwasher codes

Power loss occurred during a running cycle.

First step from the service manual

Verify power was not lost during a cycle; reset by pressing and holding start for 3 seconds.

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

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What AC Power Loss means on a Viking dishwasher

The AC Power Loss error on a Viking dishwasher indicates that the appliance lost electrical power while a wash cycle was actively running. The dishwasher's control board continuously monitors the incoming AC power supply throughout operation. When that supply is interrupted, even briefly, the control board detects the drop and logs this condition upon restoration of power. The error is essentially a memory flag stored by the control board to alert the user and technician that the cycle did not complete under normal operating conditions.

The most common trigger is a simple household power interruption: a tripped circuit breaker, a blown fuse, a brief utility outage, or even someone accidentally unplugging the unit. Because the dishwasher was mid-cycle when power dropped, the control board cannot verify the state of the wash program, water fill level, or drain status. This is why the unit flags the event rather than silently resuming.

In most cases this is not a component failure. The reset procedure involves pressing and holding the Start button for 3 seconds, which clears the flag and allows the control board to reinitialize. If the error returns immediately after a reset with no obvious power interruption, the issue may point to an unstable power supply at the outlet, a loose connection at the terminal block, or an intermittent fault within the control board itself. Persistent recurrence warrants further electrical diagnosis.

Source: manufacturer service documentation.

Common causes of AC Power Loss

  1. 01

    Household power interruption

    Wiring / connection

    A brief utility outage, a tripped circuit breaker, or a blown fuse cut power to the dishwasher mid-cycle. Check your breaker panel and reset any tripped breakers before resetting the dishwasher.

  2. 02

    Accidental unplugging or loose power cord

    Wiring / connection

    The dishwasher power cord may have been pulled loose or partially disconnected from the outlet. Inspect the connection behind or beneath the unit to confirm the cord is fully seated.

  3. 03

    Unstable or low voltage at the outlet

    Wiring / connection

    Voltage fluctuations or a weak connection at the wall outlet can cause the control board to register a power loss even without a full outage. Testing outlet voltage with a multimeter can confirm whether the supply is stable and within specification.

  4. 04

    Loose wiring at the terminal block

    Wiring / connection

    Internal wiring connections at the dishwasher terminal block can loosen over time, causing intermittent power interruptions that the control board detects as an AC loss event. A technician would need to inspect and secure these connections.

  5. 05

    Control board fault

    Part replacement

    If the error recurs repeatedly without any external power interruption, the control board itself may be misreading the power supply due to an internal component failure. Board replacement would be required in this scenario.

See the test procedure for each cause

Frequently asked questions about AC Power Loss

What does AC Power Loss mean on a Viking dishwasher?
AC Power Loss means the dishwasher detected that its electrical power supply was interrupted while a cycle was actively running. The control board logs this event when power is restored so the user is aware the cycle did not finish normally. It does not necessarily indicate a broken component. In most cases it reflects a household power event such as a tripped breaker or brief outage.
How do I fix the AC Power Loss error on my Viking dishwasher?
Start by checking your home's circuit breaker panel for any tripped breakers and reset them if needed. Then press and hold the Start button on the dishwasher for 3 seconds to clear the error and reinitialize the control board. Once reset, run a new cycle to confirm normal operation. If the error returns without a clear power interruption, have a technician inspect the outlet voltage, terminal block wiring, and control board.
Will resetting the dishwasher clear the AC Power Loss error?
Yes, pressing and holding the Start button for 3 seconds performs a reset that clears the AC Power Loss flag from the control board. This allows the dishwasher to reinitialize and start a fresh cycle. If the error reappears after resetting with no obvious external cause, further electrical diagnosis is needed to rule out a wiring or board issue.
Is the AC Power Loss error on a Viking dishwasher a safety concern?
In most cases it is not a safety concern. The error is a notification that power was lost mid-cycle, not an indication of a hazardous condition. However, if the error is caused by a repeatedly tripping breaker, that underlying electrical issue should be diagnosed by a qualified electrician before continuing to use the appliance.
How much does it cost to repair a Viking dishwasher showing an AC Power Loss error?
If the cause is simply a tripped breaker or a brief outage, there is no repair cost beyond your own time to reset the unit. If a technician visit is needed to diagnose wiring or outlet issues, expect service call fees in the range of $75 to $150. Control board replacement, if required, typically adds $200 to $500 or more depending on parts and labor rates in your area.

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