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Error code reference

Cove Dishwasher Error Code 050118

Wash pump drive system

Cove codesCove dishwasher codes

Wash pump drive system: Over voltage Vbus error.

First step from the service manual

Replace the MCM assembly. Optionally, do a power quality analysis on the utilities that supply power to the unit.

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

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What 050118 means on a Cove dishwasher

Error code 050118 on a Cove dishwasher indicates an over voltage condition on the Vbus (voltage bus) within the wash pump drive system. The Vbus is the internal DC voltage rail that the motor control module (MCM) uses to drive the wash pump motor. When this voltage rises above the acceptable operating threshold, the control system detects the fault and halts operation to protect the drive circuitry and motor windings from damage caused by excessive voltage stress.

The MCM assembly is responsible for converting incoming AC line power into the controlled DC and variable-frequency AC signals that drive the wash pump motor. An over voltage event on the Vbus can result from incoming utility power that exceeds normal voltage tolerances, transient voltage spikes on the supply line, or an internal failure within the MCM itself. Regenerative voltage events, which can occur when the motor decelerates rapidly, may also cause a Vbus spike if the drive system cannot dissipate the energy quickly enough.

Because the MCM assembly both monitors and controls the Vbus, a failure within that module can produce false over voltage readings or create actual over voltage conditions. The recommended first diagnostic step is replacement of the MCM assembly. If the fault recurs after MCM replacement, a power quality analysis of the supply circuit is advised to identify utility-side issues such as voltage swells, harmonic distortion, or inadequate grounding that may be contributing to the condition.

Source: manufacturer service documentation.

Common causes of 050118

  1. 01

    Failed MCM assembly

    Part replacement

    The motor control module (MCM) is the most likely source of this fault. An internal component failure within the MCM can cause it to generate or falsely report an over voltage condition on the Vbus, triggering the 050118 error.

  2. 02

    Utility supply voltage swell or spike

    Wiring / connection

    Incoming AC line voltage that exceeds normal tolerances can push the internal Vbus above its rated limit. A power quality analysis on the supply circuit can confirm whether voltage irregularities are present.

  3. 03

    Transient voltage events on the supply line

    Wiring / connection

    Short-duration voltage spikes caused by other appliances cycling on the same circuit, or by external utility disturbances, can trigger an over voltage fault in the drive system. Checking for shared high-load devices on the circuit is a useful first step.

  4. 04

    Inadequate grounding of the supply circuit

    Wiring / connection

    A poorly grounded electrical circuit can contribute to voltage irregularities that affect the Vbus stability within the wash pump drive. Verifying that the dishwasher's supply circuit is properly grounded and meets installation specifications can help rule this out.

  5. 05

    Regenerative voltage spike from motor deceleration

    Part replacement

    When the wash pump motor decelerates rapidly, it can generate voltage back into the Vbus rail. If the MCM cannot absorb or dissipate this energy properly, it may trigger an over voltage fault. This scenario typically points back to MCM failure as the root cause.

See the test procedure for each cause

Frequently asked questions about 050118

What does 050118 mean on a Cove dishwasher?
Error code 050118 indicates an over voltage condition on the Vbus within the wash pump drive system. The Vbus is the internal voltage rail that powers the wash pump motor through the motor control module (MCM). When voltage on this rail exceeds safe operating limits, the dishwasher shuts down and displays this code to prevent damage to the drive electronics and motor. The fault can originate from a failed MCM assembly or from voltage problems on the incoming utility supply.
Can I fix error code 050118 myself?
The primary fix for this error is replacement of the MCM assembly, which is an internal electronic control component. Replacing this part requires disassembly of the dishwasher and comfort working with electrical components, so most homeowners will want to hire a qualified appliance technician. If the error persists after MCM replacement, a licensed electrician may need to perform a power quality analysis on the circuit supplying the dishwasher.
Is it safe to use my Cove dishwasher while error 050118 is active?
You should not continue operating the dishwasher while this fault is present. The error indicates that the wash pump drive system detected an unsafe voltage level, and the machine shuts down specifically to prevent damage to its internal electronics. Running the unit with an unresolved over voltage condition could cause further damage to the MCM or motor, increasing repair costs.
How much does it cost to repair error code 050118 on a Cove dishwasher?
Repair costs will vary depending on whether the issue lies with the MCM assembly or with the incoming power supply. MCM assembly parts for Cove dishwashers are premium components, and combined with labor, repair costs typically range from a few hundred dollars to over five hundred dollars. If a power quality analysis and electrical corrections are also needed, additional costs from a licensed electrician should be factored in.
Will resetting my Cove dishwasher clear error code 050118?
A power reset may temporarily clear the fault code, but the error is likely to return if the underlying cause has not been corrected. If the MCM assembly has failed or if there is an ongoing voltage problem on the supply circuit, the 050118 code will reappear once the dishwasher attempts to run the wash pump again. A reset alone is not a substitute for diagnosing and repairing the root cause.

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