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Error code reference

Viking Dishwasher Error Code 3-5

Motor undervoltage error

Viking codesViking dishwasher codes

Motor undervoltage error – motor control communicates a low motor control voltage condition (325E/450E only).

First step from the service manual

Verify supply voltage is in specification.

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

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What 3-5 means on a Viking dishwasher

Error code 3-5 on Viking dishwashers (applicable to 325E and 450E models only) indicates a motor undervoltage condition. The motor control board monitors the voltage supplied to the drive motor circuit, and when that voltage drops below acceptable operating thresholds, the control system flags this fault and halts operation. This is a protective measure to prevent motor damage that could result from running under insufficient voltage.

The most direct cause of this error is inadequate incoming supply voltage to the dishwasher. If the household circuit supplying the unit is delivering low voltage, whether due to a weak circuit, a shared load pulling voltage down, or a problem at the breaker or wiring connections, the motor control board will detect that condition and report error 3-5. The first diagnostic step is to measure the supply voltage at the dishwasher's power source and confirm it falls within the required specification.

Beyond the supply side, internal causes can also trigger this code. A failing motor control board may misread or actually produce low voltage internally, and degraded wiring connections between the control board and the motor can introduce resistance that drops effective voltage below the required level. Since this code is specific to the 325E and 450E platform, the motor control module on these models plays a central role in both detecting and potentially causing the fault.

Source: manufacturer service documentation.

Common causes of 3-5

  1. 01

    Low or inadequate supply voltage

    Wiring / connection

    If the household circuit supplying the dishwasher is delivering below-specification voltage, the motor control will flag this error. Check the voltage at the outlet or hardwire connection with a multimeter to confirm it meets the required specification.

  2. 02

    Loose or corroded wiring connections

    Wiring / connection

    Poor connections at the power supply terminals, junction box, or between the motor control board and the drive motor can cause a voltage drop sufficient to trigger this fault. Inspect all wiring connections for looseness, corrosion, or heat damage.

  3. 03

    Faulty motor control board

    Part replacement

    The motor control board on 325E and 450E models both monitors and regulates voltage to the motor. If the board itself is failing or has a damaged component, it may produce or report low voltage even when supply voltage is correct.

  4. 04

    Tripped or weak circuit breaker

    Part replacement

    A circuit breaker that is partially tripped or beginning to fail can allow current to pass while restricting voltage to the appliance. Reset the breaker and test voltage, and replace the breaker if it cannot hold proper voltage under load.

  5. 05

    Drive motor with degraded windings

    Part replacement

    A motor with deteriorating windings can draw irregular current that causes the control board to detect an undervoltage condition. If supply voltage and board function both check out, the motor itself should be tested.

See the test procedure for each cause

Frequently asked questions about 3-5

What does 3-5 mean on a Viking dishwasher?
Error code 3-5 indicates a motor undervoltage condition and is specific to Viking 325E and 450E dishwasher models. The motor control board has detected that the voltage available to the motor circuit is below acceptable levels. The dishwasher stops operation to protect the motor from potential damage caused by running at insufficient voltage.
How do I fix error code 3-5 on a Viking dishwasher?
Start by measuring the supply voltage at the dishwasher's power source to confirm it is within the required specification. If supply voltage is correct, inspect all wiring connections to the motor and motor control board for looseness or corrosion. If wiring and supply voltage both check out, the motor control board or drive motor may need to be tested and potentially replaced.
Will resetting my Viking dishwasher clear error code 3-5?
A reset may temporarily clear the fault display, but if the underlying voltage issue has not been resolved, the error will return once the dishwasher attempts to run the motor again. Resetting is a useful first step to confirm whether the fault is persistent, but it is not a fix for the root cause.
Is it safe to use my Viking dishwasher when error 3-5 is showing?
The dishwasher is designed to halt operation when this code appears, so running a cycle is typically not possible until the fault is addressed. Do not attempt to bypass the error, as operating a motor under low voltage conditions can cause overheating and permanent motor damage. Have the supply voltage and internal components inspected before returning the unit to service.
How much does it cost to repair Viking dishwasher error code 3-5?
Repair costs depend on the root cause. If the issue is a loose wiring connection or a tripped breaker, the cost may be minimal, covering only a service call fee in the range of $75 to $150. If the motor control board requires replacement, parts and labor combined can range from $200 to $500 or more. Drive motor replacement on these models typically falls in a similar or higher range depending on labor rates in your area.

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