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Error code reference

Maytag Washer Error Code T-11

Invalid cycle data.

Maytag codesMaytag washer codes

Invalid cycle data.

First step from the service manual

Check UI-ACU connection.

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

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What T-11 means on a Maytag washer

The T-11 error code on a Maytag washer indicates that the control system has detected invalid cycle data. This means the Appliance Control Unit (ACU) is receiving cycle selection information that it cannot interpret or process correctly. The ACU is the main control board that manages wash cycles, motor operation, water fill, and timing sequences. When the data transmitted from the User Interface (UI) board to the ACU does not match expected parameters, the machine halts and logs this fault to prevent running an undefined or corrupted cycle.

The communication path between the UI board and the ACU is the primary area to investigate. These two components exchange cycle selection data through a wiring harness connection. If that connection is loose, corroded, or damaged, the signal may become garbled or incomplete, resulting in cycle data the ACU flags as invalid. The first diagnostic step is always to inspect and reseat the UI-to-ACU connector to rule out a simple wiring issue before replacing any components.

Beyond connection problems, a failed UI board can transmit corrupt or out-of-range cycle data, and a faulty ACU may misread otherwise valid signals. In some cases, a software glitch or power fluctuation can cause a temporary data error that clears after a reset. Persistent T-11 faults that return after a reset and after the wiring connection is confirmed secure typically point to a defective UI board or ACU requiring component-level diagnosis and replacement.

Source: manufacturer service documentation.

Common causes of T-11

  1. 01

    Loose or disconnected UI-ACU wiring harness

    Wiring / connection

    The connector linking the User Interface board to the Appliance Control Unit may be partially seated, corroded, or unplugged. Inspecting and firmly reseating this connector is the first and most likely fix.

  2. 02

    Damaged wiring between UI and ACU

    Part replacement

    Wires in the harness running between the UI board and ACU can become pinched, frayed, or broken, interrupting the data signal. Visually trace the harness and check for any visible damage or continuity breaks.

  3. 03

    Faulty User Interface (UI) board

    Part replacement

    A failed UI board may transmit corrupted or out-of-range cycle selection data to the ACU, triggering T-11. This is suspected when the wiring connection is confirmed secure but the fault persists.

  4. 04

    Faulty Appliance Control Unit (ACU)

    Part replacement

    If the ACU itself is malfunctioning, it may misinterpret valid cycle data from the UI board and log a T-11 fault. This is typically diagnosed after the UI board and all wiring have been ruled out.

  5. 05

    Temporary software or power glitch

    Wiring / connection

    A brief power fluctuation or control board lockup can cause a one-time invalid data error. Performing a reset by unplugging the washer for one to two minutes may clear the fault if no hardware issue is present.

See the test procedure for each cause

Frequently asked questions about T-11

What does T-11 mean on a Maytag washer?
T-11 indicates that the Appliance Control Unit (ACU) received invalid cycle data from the User Interface (UI) board and could not process a valid wash cycle. The machine stops operation and displays this code to prevent running an undefined cycle. The fault points to a communication problem between the control panel and the main control board, whether from a loose connection, damaged wiring, or a failed component.
How do I fix a T-11 error on my Maytag washer?
Start by unplugging the washer and inspecting the wiring harness connector between the UI board and the ACU, reseating it firmly if it appears loose. If the error returns after restoring power, examine the harness for any visible damage such as fraying or pinched wires. Persistent faults after confirming the connection is secure typically require testing or replacing the UI board or the ACU.
Will resetting my Maytag washer clear the T-11 error?
A reset, done by unplugging the washer for one to two minutes, can clear T-11 if the fault was caused by a temporary power fluctuation or software glitch. However, if the code returns after the reset, there is an underlying hardware problem with the wiring or one of the control boards that must be addressed. Repeated resets will not fix a faulty component.
Is it safe to use my Maytag washer when it shows T-11?
A T-11 fault typically prevents the washer from starting or completing a cycle, so continued use is not possible until the issue is resolved. The error is not associated with a water leak or electrical hazard, but the machine should not be forced through a cycle while the fault is active. Address the diagnostic steps before attempting further operation.
How much does it cost to repair a Maytag washer T-11 error?
If the fix is simply reseating a loose connector, there may be no parts cost, only a service call fee which typically ranges from $75 to $150 depending on your area. Replacing a UI board generally costs between $100 and $250 for the part, while an ACU replacement can range from $150 to $350 or more for the part alone. Labor costs will add to those figures if a technician performs the repair.

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