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Error code reference

Kenmore Dishwasher Error Code Uo

General malfunction error code displayed when the dishwasher malfunctions or gives poor performance.

Kenmore codesKenmore dishwasher codes

General malfunction error code displayed when the dishwasher malfunctions or gives poor performance.

First step from the service manual

Call the Kenmore Customer Care Center at 1-800-4MY-HOME for troubleshooting assistance and/or locating an authorized service technician.

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

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What Uo means on a Kenmore dishwasher

The Uo error code on a Kenmore dishwasher is a general malfunction indicator, meaning the control system has detected an operational fault or a pattern of poor performance that does not map to a more specific fault code. Rather than pointing to a single component, Uo signals that something within the dishwasher's operation has deviated from expected parameters. This could involve the control board, sensors, water delivery, or wash performance falling outside acceptable ranges.

Because Uo is a broad catch-all code, it does not narrow the diagnosis to a single subsystem. The dishwasher's electronic control board monitors multiple inputs during a cycle, and when an anomaly is detected that does not trigger a more specific code, Uo is displayed. Common contributors include irregularities in water temperature, fill levels, spray arm function, or intermittent electrical faults affecting normal cycle completion.

Diagnosing Uo reliably requires evaluating overall dishwasher performance alongside any observable symptoms, such as dishes not cleaning properly, incomplete cycles, or unusual sounds. Because the fault is non-specific, Kenmore directs users to contact their Customer Care Center at 1-800-4MY-HOME as the first step. A trained technician can run diagnostic routines to isolate which subsystem is responsible for triggering the general malfunction flag.

Source: manufacturer service documentation.

Common causes of Uo

  1. 01

    Control Board Fault

    Part replacement

    The electronic control board may be experiencing an intermittent failure or internal error, causing it to log a general malfunction rather than a specific fault. Look for erratic behavior across multiple cycles or inconsistent responses to button presses.

  2. 02

    Poor Wash Performance

    Wiring / connection

    If the dishwasher is failing to clean dishes adequately, the control system may log Uo as a performance fault. Check spray arms for clogs, water temperature at the source, and detergent usage.

  3. 03

    Water Supply Issue

    Wiring / connection

    Insufficient water pressure or a restricted inlet can cause the dishwasher to underperform and trigger a general malfunction code. Verify the water supply valve is fully open and the inlet screen is not blocked.

  4. 04

    Sensor Malfunction

    Part replacement

    A faulty turbidity, temperature, or water level sensor can cause the control board to receive out-of-range readings, which may result in a Uo code when no other specific fault applies. A technician can test sensor outputs to identify the faulty component.

  5. 05

    Intermittent Wiring or Connection Problem

    Wiring / connection

    Loose or corroded wiring harness connections between the control board and other components can cause sporadic communication failures that register as a general malfunction. Inspect connectors for corrosion or signs of heat damage.

See the test procedure for each cause

Frequently asked questions about Uo

What does Uo mean on a Kenmore dishwasher?
Uo is a general malfunction error code indicating that the dishwasher has experienced a fault or a period of poor performance that does not correspond to a more specific error. The control board uses this code as a catch-all when it detects something is wrong but cannot isolate it to a single component. Kenmore recommends contacting their Customer Care Center at 1-800-4MY-HOME for further guidance.
Can I fix the Uo error code myself?
Some underlying causes of Uo, such as a clogged spray arm, restricted water supply valve, or basic maintenance issues, can be addressed without professional help. However, because Uo is a non-specific code, pinpointing the exact problem often requires diagnostic tools and technical knowledge. If basic checks do not resolve the issue, contacting Kenmore support or scheduling a service visit is the recommended path.
Is it safe to keep using my dishwasher when the Uo code is showing?
Running the dishwasher with an active Uo code is generally not recommended until the root cause is identified. Continuing to operate a malfunctioning appliance can worsen the underlying problem or result in unsatisfactory wash results. If you notice any water leaks, burning smells, or electrical irregularities alongside the code, stop use immediately and contact a technician.
Will resetting the dishwasher clear the Uo error code?
A power reset, typically done by unplugging the dishwasher or turning off the circuit breaker for a few minutes, may temporarily clear the Uo code. However, if the underlying fault is still present, the code is likely to return during or after the next cycle. A reset alone does not fix the root cause and should only be used as an initial troubleshooting step.
How much does it cost to repair a Kenmore dishwasher showing a Uo error?
Repair costs vary widely depending on the root cause. Simple fixes like clearing a clogged spray arm or adjusting a water supply valve may cost little to nothing, while replacing a faulty control board or sensor can range from roughly $150 to $400 or more including parts and labor. Getting a diagnostic assessment from an authorized technician will provide a more accurate estimate for your specific situation.

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