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Error code reference

Viking Dishwasher Error Code E:18

Low voltage error.

Viking codesViking dishwasher codes

Low voltage error.

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What E:18 means on a Viking dishwasher

The E:18 error code on a Viking dishwasher indicates a low voltage condition has been detected by the control board. The control system continuously monitors incoming supply voltage during operation, and when that voltage drops below the acceptable operating threshold, the unit triggers this fault and halts the cycle to prevent damage to sensitive electronic components and motor-driven systems. Low voltage can impair pump motor performance, heating element output, and control board logic reliability.

The root cause of E:18 is typically found either at the household electrical supply level or within the dishwasher's internal wiring and power delivery path. A weak or overloaded circuit, a failing outlet, undersized wiring, or a tripped breaker that has partially reset can all result in insufficient voltage reaching the appliance. In some cases, a shared circuit with high-draw appliances can cause momentary voltage sags during operation that trigger the fault.

Before assuming a component inside the dishwasher has failed, the incoming line voltage should be measured at the outlet or junction box with the dishwasher under load. Residential dishwashers typically require a stable 120V supply within a defined tolerance range. If line voltage is confirmed to be adequate, the internal wiring harness, terminal connections, and the main control board's power regulation circuitry should be inspected for faults that could cause the board to read voltage incorrectly.

Source: manufacturer service documentation.

Common causes of E:18

  1. 01

    Low or unstable household supply voltage

    Wiring / connection

    A weak utility supply, overloaded circuit, or undersized wiring can cause voltage to drop below the dishwasher's required operating level. Measuring voltage at the supply point with a multimeter while the unit is running can confirm this.

  2. 02

    Shared circuit with high-draw appliances

    Wiring / connection

    If the dishwasher shares a circuit with refrigerators, microwaves, or other high-draw devices, simultaneous operation can cause voltage sags that trigger E:18. The dishwasher should ideally be on a dedicated circuit.

  3. 03

    Partially tripped or faulty circuit breaker

    Part replacement

    A breaker that has partially tripped or is beginning to fail may still pass some current but not at full rated voltage. The breaker should be fully reset or tested and replaced if suspect.

  4. 04

    Loose or corroded wiring connections

    Wiring / connection

    Loose terminals at the wall outlet, junction box, or internal wiring harness connectors can create resistance that reduces effective voltage to the control board. Inspect all connections for corrosion, burning, or looseness.

  5. 05

    Faulty main control board

    Part replacement

    If supply voltage is confirmed to be correct and all wiring connections are secure, the control board's internal voltage sensing circuit may have failed, causing it to report a false low voltage fault. Board replacement would be required in this scenario.

See the test procedure for each cause

Frequently asked questions about E:18

What does E:18 mean on a Viking dishwasher?
E:18 on a Viking dishwasher indicates a low voltage error, meaning the control board has detected that the incoming electrical supply voltage has dropped below the acceptable operating range. The dishwasher stops operation to protect its electronics and motors from running under insufficient power. The issue can originate from the home's electrical system or from internal wiring problems.
Can I fix the E:18 error myself?
Some causes of E:18 are DIY-friendly, such as checking that the dishwasher's circuit breaker is fully engaged and that no other high-draw appliances are sharing the same circuit. Using a multimeter to verify that line voltage at the outlet is within the proper range is also a practical first step. However, if the issue involves internal wiring, the control board, or the home's electrical panel, a licensed electrician or appliance technician should handle the repair.
Is it safe to keep using the dishwasher when E:18 appears?
No, you should not attempt to continue running the dishwasher while the E:18 fault is active. Low voltage conditions can cause motor overheating, incomplete cycles, and damage to the control board over time. The dishwasher's protective shutdown is designed to prevent this damage, and it should remain off until the root cause is identified and corrected.
How much does it cost to repair an E:18 error on a Viking dishwasher?
Repair costs vary widely depending on the cause. If the fix is as simple as resetting a breaker or redistributing circuit load, there may be no cost at all. Electrician visits to address wiring or panel issues typically run in the range of $75 to $250 or more. If the main control board needs replacement, parts and labor combined can range from $200 to $500 or higher depending on parts availability and service rates in your area.
Will resetting the dishwasher clear the E:18 error code?
Resetting the dishwasher may temporarily clear the E:18 code, but the fault will return if the underlying low voltage condition is not resolved. A reset does not fix a weak electrical supply, a failing breaker, or a faulty wiring connection. Treat the reset only as a way to confirm whether the error reappears, and use it as a starting point for diagnosing the actual cause.

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