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Error code reference

Maytag Washer Error Code T-04

Configuration mismatch between UI and ACU.

Maytag codesMaytag washer codes

Configuration mismatch between UI and ACU.

First step from the service manual

Check UI-ACU configuration.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What T-04 means on a Maytag washer

The T-04 error code on a Maytag washer indicates a configuration mismatch between the User Interface (UI) control board and the Appliance Control Unit (ACU). These two control modules must share matching software or firmware configuration data to communicate properly. When the washer detects that the UI and ACU are not aligned in their configuration parameters, it halts normal operation and displays this code to alert the technician or user that a fundamental compatibility issue exists between the two control systems.

This mismatch can occur after a control board replacement where the replacement part carries different firmware or is programmed for a different model variant. It can also arise from a software corruption event, such as a power surge or interrupted firmware update, that leaves one module out of sync with the other. In some cases, the issue stems from a part being installed from a different production run or regional variant, even if the part number appears visually similar or compatible.

The first diagnostic step is to verify the configuration of both the UI and the ACU. This typically involves checking that both boards are the correct part numbers for the specific model and that any required software initialization or calibration procedure has been completed after installation. If a recent control board replacement was performed, confirming the replacement part is an exact match for the model is critical before proceeding to further diagnostics.

Source: manufacturer service documentation.

Common causes of T-04

  1. 01

    Incorrect replacement control board installed

    Part replacement

    If either the UI or ACU was recently replaced with a part intended for a different model or variant, the two boards will not share the same configuration. Verify that the part numbers on both boards match the specifications for your exact washer model.

  2. 02

    Firmware or software mismatch between UI and ACU

    Wiring / connection

    A power surge, interrupted update, or factory programming difference can leave the UI and ACU running incompatible firmware versions. This causes the configuration check to fail even if the physical hardware appears correct.

  3. 03

    Post-replacement initialization not completed

    Wiring / connection

    After installing a new control board, certain Maytag washers require a configuration or calibration procedure to sync the UI and ACU. Skipping this step can trigger T-04 even when the correct parts are installed.

  4. 04

    Faulty or damaged UI control board

    Part replacement

    A UI board that has experienced internal failure may report incorrect configuration data to the ACU, generating the T-04 code. Check for visible damage such as burnt components or corroded connectors on the UI board.

  5. 05

    Faulty or damaged ACU

    Part replacement

    A failing ACU can misread or fail to recognize the UI configuration data. If the UI board has been confirmed correct and all initialization steps completed, the ACU should be evaluated as a potential source of the mismatch.

See the test procedure for each cause

Frequently asked questions about T-04

What does T-04 mean on a Maytag washer?
T-04 indicates a configuration mismatch between the User Interface (UI) board and the Appliance Control Unit (ACU). These two control modules must be programmed to compatible configurations to work together. When the washer detects they are out of sync, it displays T-04 and stops normal operation. This is most commonly seen after a control board replacement.
Can I fix the T-04 error myself, or do I need a technician?
Some causes of T-04, such as an incomplete initialization procedure after a board replacement, may be addressable without replacing parts. However, diagnosing a firmware mismatch or confirming correct board part numbers requires access to model-specific configuration data and service procedures. If a control board needs to be replaced, a technician familiar with Maytag control systems is recommended to ensure the correct part is sourced and properly initialized.
Is it safe to use my Maytag washer when T-04 is displayed?
The washer is designed to prevent normal operation when T-04 is active, so completing a full wash cycle is generally not possible in this state. Attempting to force operation with a control system mismatch could lead to unpredictable behavior. It is best to leave the washer off and address the error before running any loads.
Will resetting my Maytag washer clear the T-04 error code?
A simple power reset is unlikely to clear T-04 permanently because the error reflects an actual configuration difference between the UI and ACU, not a temporary glitch. The code will return after a reset if the underlying mismatch is not corrected. A reset can be useful to confirm whether the error is persistent, but it does not resolve the root cause.
How much does it cost to repair a Maytag washer T-04 error?
Repair costs vary depending on what is causing the mismatch. If only an initialization procedure is needed, labor costs from a technician could range from roughly $75 to $150. If a control board replacement is required, parts for a UI board or ACU typically range from $100 to $350 or more depending on the model, with additional labor on top of that. Getting a diagnostic appointment first is the best way to estimate the total cost for your specific situation.

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