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Error code reference

Viking Dishwasher Error Code Flash both LED1 and LED2 continuously

Moisture sensor water detection

Viking codesViking dishwasher codes

Moisture sensor water detection – moisture sensor output is equivalent to water in the pan.

First step from the service manual

Check for water in base pan from overflow/leak; check for defective moisture sensor.

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

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What Flash both LED1 and LED2 continuously means on a Viking dishwasher

When both LED1 and LED2 flash continuously on a Viking dishwasher, the control board has detected a signal from the moisture sensor indicating that water is present in the base pan beneath the wash tub. The moisture sensor is positioned in the bottom pan of the appliance and monitors for any liquid accumulation in that area. When water contacts the sensor, its output signal changes to a level that the control interprets as a flood or leak condition, triggering the dual LED alert to halt operation and protect the surrounding cabinetry and flooring.

The most common cause of this fault is an actual water leak or overflow that has allowed water to collect in the base pan. Leaks can originate from a failed door gasket, a cracked spray arm, a loose or deteriorated inlet valve connection, a faulty pump seal, or an overfill condition caused by a defective float switch or water inlet valve. Any of these failures can direct water downward into the pan where the sensor is located, producing a legitimate detection event.

The secondary possibility is a defective moisture sensor itself. If the sensor has failed internally or its wiring harness has a short or corroded connector, it can output a signal equivalent to water detection even when the base pan is completely dry. Diagnosing this requires physically inspecting the base pan for standing water first. If the pan is dry, the sensor or its circuit should be tested. Clearing the water alone will not resolve the fault if the underlying leak source is not identified and repaired.

Source: manufacturer service documentation.

Common causes of Flash both LED1 and LED2 continuously

  1. 01

    Water leak into the base pan

    Part replacement

    A leak from the door gasket, pump seal, hose connection, or inlet valve can allow water to drip or flow into the base pan and trigger the moisture sensor. Pulling the dishwasher forward and inspecting the pan for standing water will confirm this is the cause.

  2. 02

    Overfill condition

    Part replacement

    A stuck or failed water inlet valve or a malfunctioning float switch can allow the tub to overfill, causing water to spill over into the base pan. Check whether the tub fills excessively during a cycle and inspect the float switch for debris or damage.

  3. 03

    Failed door gasket or seal

    Part replacement

    A worn, cracked, or improperly seated door gasket allows water to escape around the door and run down into the base pan during operation. Inspect the full perimeter of the door seal for tears, compression failures, or gaps.

  4. 04

    Defective moisture sensor

    Part replacement

    If no water is found in the base pan, the moisture sensor itself may have failed and is outputting a false water-detected signal. The sensor wiring harness should also be inspected for corroded terminals or shorts that could produce the same erroneous reading.

  5. 05

    Condensation or residual moisture accumulation

    Wiring / connection

    In some cases, excessive condensation or a minor past leak that was not fully dried can leave enough residual moisture in the pan to trigger the sensor. Thoroughly drying the base pan and running the unit again can help determine if an active leak is present.

See the test procedure for each cause

Frequently asked questions about Flash both LED1 and LED2 continuously

What does Flash both LED1 and LED2 continuously mean on a Viking dishwasher?
This continuous dual LED flash indicates that the moisture sensor in the base pan of the dishwasher has detected water or a signal equivalent to water being present beneath the tub. The control board shuts down operation to prevent water damage. The fault points to either an actual water leak inside the unit or a defective moisture sensor producing a false reading.
How do I fix the Flash both LED1 and LED2 continuously error on my Viking dishwasher?
Start by pulling the dishwasher out and inspecting the base pan for standing water. If water is present, trace the source of the leak by checking the door gasket, pump seals, inlet valve connections, and hose fittings, then repair or replace the faulty component. After removing all water from the pan and drying the area thoroughly, the sensor should clear once the pan is dry. If the pan is dry but the error persists, the moisture sensor or its wiring harness should be tested and replaced if found defective.
Is it safe to run my Viking dishwasher when both LED1 and LED2 are flashing?
No, you should not continue operating the dishwasher while this fault is active. The error indicates a possible active water leak that could damage your flooring, cabinetry, or electrical components beneath the unit. The dishwasher disables itself for this reason, and running it again before the fault is resolved risks worsening any existing water damage.
Will resetting the dishwasher clear the Flash both LED1 and LED2 continuously error?
A reset will not permanently clear this error if the underlying cause is still present. As long as water remains in the base pan or the moisture sensor continues to output a water-detected signal, the fault will return as soon as the unit attempts to operate. The physical cause, either the source of the leak or the faulty sensor, must be addressed before the error will stay cleared.
How much does it cost to repair a Viking dishwasher showing this moisture sensor error?
Repair costs vary depending on what caused the leak. Replacing a door gasket typically runs in the range of $50 to $150 in parts and labor, while a pump seal or inlet valve repair can range from $100 to $300 or more depending on parts and service rates in your area. If only the moisture sensor has failed and no actual leak is present, sensor replacement is generally a lower-cost repair, though labor costs for accessing the base pan area should be factored in.

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