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Error code reference

Viking Dishwasher Error Code Moisture Sensor - water detection

Moisture sensor output is equivalent to water in the base pan.

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Moisture sensor output is equivalent to water in the base pan.

First step from the service manual

Check for water in base pan from overflow/leak; check 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 Moisture Sensor - water detection means on a Viking dishwasher

The moisture sensor error on a Viking dishwasher indicates that the moisture sensor located in the base pan has detected a level of water equivalent to an actual water presence in that area. The base pan sits beneath the inner tub and is designed to remain dry during normal operation. When the moisture sensor registers a wet condition, the control board interprets this as a potential leak or overflow situation and triggers the error to protect the unit and surrounding cabinetry from water damage.

The moisture sensor itself is a small component that monitors electrical conductivity or resistance changes caused by water contact. When water bridges the sensor contacts, the output signal changes in a way that the control board recognizes as a fault condition. This can be caused by an actual water leak from internal components such as the door gasket, pump housing, water inlet valve, or hose connections, or it can be triggered by a defective sensor that is sending a false positive signal even when no water is present.

Diagnosing this error requires physically inspecting the base pan for standing water before condemning any component. If water is found, the source of the leak must be traced and repaired. If the base pan is dry, the moisture sensor itself should be tested for proper function. A sensor that reads a wet condition when the pan is dry indicates a failed sensor requiring replacement.

Source: manufacturer service documentation.

Common causes of Moisture Sensor - water detection

  1. 01

    Active water leak in the base pan

    Part replacement

    A leak from internal components such as the door gasket, pump housing, water inlet valve, or drain hose connections can allow water to collect in the base pan and trigger the sensor. Pull the dishwasher forward and inspect the base pan for standing water to confirm.

  2. 02

    Door gasket failure

    Part replacement

    A worn, cracked, or displaced door gasket allows water to escape the tub during wash cycles and drip into the base pan. Inspect the gasket around the full perimeter of the door for damage or gaps.

  3. 03

    Faulty water inlet valve

    Part replacement

    A water inlet valve that fails to fully close can cause slow dripping or overfilling, leading to water accumulating in the base pan. Check for signs of moisture around the valve body and supply line connections.

  4. 04

    Defective moisture sensor

    Part replacement

    The moisture sensor itself can fail and report a wet condition even when the base pan is completely dry. If the base pan is dry and no leak source is found, the sensor should be tested and replaced if it is generating a false output signal.

  5. 05

    Residual moisture from a prior leak

    Wiring / connection

    If a leak occurred previously and was not fully dried out, residual moisture on or around the sensor contacts can continue to trigger the error. Thoroughly dry the base pan and sensor area before testing whether the fault clears.

See the test procedure for each cause

Frequently asked questions about Moisture Sensor - water detection

What does Moisture Sensor - water detection mean on a Viking dishwasher?
This error means the moisture sensor in the base pan beneath the dishwasher tub has detected a condition equivalent to water being present in that area. The control board triggers this fault to stop operation and prevent further water damage. It can indicate an actual internal leak or a failed sensor sending a false signal. Inspecting the base pan for standing water is the recommended first step.
How do I fix the moisture sensor error on my Viking dishwasher?
Start by pulling the dishwasher out far enough to inspect the base pan for standing water. If water is present, identify and repair the leak source, which could be the door gasket, inlet valve, pump, or hose connections. After repairs, dry the base pan completely before restoring power. If no water is found, the moisture sensor itself may be defective and need replacement.
Is it safe to run my Viking dishwasher when the moisture sensor error is active?
You should not run the dishwasher while this error is active. The error indicates a possible water leak beneath the unit, and continuing to operate it risks water damage to your flooring and cabinetry. The dishwasher's control board triggers this fault specifically to prevent further damage, so the underlying cause should be diagnosed and resolved first.
Will resetting the dishwasher clear the moisture sensor error?
A reset may temporarily clear the error code from the display, but it will return if the underlying condition has not been corrected. If water remains in the base pan or the moisture sensor is defective, the fault will trigger again once the unit is powered and the sensor is polled. The root cause must be resolved for the error to stay cleared.
How much does it cost to repair a Viking dishwasher moisture sensor error?
Repair costs vary depending on the cause. Replacing a moisture sensor alone is typically a lower-cost repair, often in the range of $75 to $200 including parts and labor. If the error is caused by a failed inlet valve, door gasket, or pump seal, costs can range from $150 to $400 or more depending on the specific component and labor rates in your area. Getting a diagnostic inspection before committing to repairs is recommended.

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