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Error code reference

Maytag Washer Error Code T-05

State mismatch between UI and ACU status.

Maytag codesMaytag washer codes

State mismatch between UI and ACU status.

First step from the service manual

Cycle power.

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

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What T-05 means on a Maytag washer

The T-05 error code on a Maytag washer indicates a state mismatch between the User Interface (UI) board and the Appliance Control Unit (ACU). These two control components are in constant communication during washer operation, and each maintains an internal record of the machine's current operating state. When the UI reports a status that conflicts with what the ACU expects, or vice versa, the system flags this discrepancy as T-05. This type of fault is fundamentally a communication and synchronization problem between two microprocessor-controlled boards.

The most common trigger for this mismatch is a temporary communication disruption, such as a power fluctuation, a brief wiring fault, or a software timing issue that causes one board to fall out of sync with the other. Because the two boards use a coordinated handshake protocol to track cycle states, even a momentary interruption can leave one board in a different logical state than the other. This is why a power cycle, which forces both boards to reinitialize from the same baseline, is the recommended first diagnostic step.

If the error persists after cycling power, the underlying cause is likely a hardware fault on either the UI board or the ACU, a loose or damaged wiring harness connection between the two components, or a software corruption issue on one of the boards. Technicians should inspect the wiring harness connecting the UI to the ACU for signs of damage, corrosion, or poor seating before considering board replacement. Persistent T-05 faults that do not resolve with power cycling typically require component-level diagnosis to isolate which board is producing the incorrect state signal.

Source: manufacturer service documentation.

Common causes of T-05

  1. 01

    Temporary communication glitch

    Wiring / connection

    A brief power fluctuation or software timing issue can cause the UI and ACU to fall out of sync without any physical hardware fault. Cycling power forces both boards to reinitialize, which resolves the mismatch in many cases.

  2. 02

    Loose or damaged wiring harness

    Wiring / connection

    The wiring harness connecting the UI board to the ACU can develop loose connector pins, corrosion, or physical damage that interrupts communication. Inspect each connector for proper seating and signs of wear or burning.

  3. 03

    Faulty User Interface (UI) board

    Part replacement

    If the UI board is failing, it may report an incorrect operating state to the ACU, triggering the mismatch error persistently. This is suspected when the error returns immediately after power cycling and the wiring checks out.

  4. 04

    Faulty Appliance Control Unit (ACU)

    Part replacement

    A failing ACU may misinterpret or incorrectly track the current cycle state, causing a conflict with the UI. This is typically diagnosed after the UI board and wiring have been ruled out.

  5. 05

    Power supply instability

    Wiring / connection

    Inconsistent voltage from the household power supply or a weak outlet connection can intermittently disrupt board communication. Check that the washer is plugged directly into a properly grounded outlet with stable voltage.

See the test procedure for each cause

Frequently asked questions about T-05

What does T-05 mean on a Maytag washer?
T-05 indicates a state mismatch between the User Interface board and the Appliance Control Unit. These two boards are supposed to stay synchronized on what the washer is doing at all times. When their internal status records conflict, the washer flags T-05 to alert the user or technician. The first recommended step is to cycle power by unplugging the unit for about one minute.
Will resetting my Maytag washer clear the T-05 error?
In many cases, yes. Unplugging the washer from the outlet for approximately one minute and then restoring power forces both control boards to reinitialize from the same starting state, which can clear the mismatch. If T-05 returns after the reset, a hardware fault in the wiring, UI board, or ACU is likely and further diagnosis is needed.
Is it safe to use my Maytag washer when T-05 is displayed?
The washer will typically halt operation when T-05 is active, as the control system cannot reliably coordinate a wash cycle when the two boards disagree on the machine's state. Attempting to force operation is not recommended until the fault is resolved. Try a power cycle first, and if the error clears without returning, normal use can resume.
How do I fix a T-05 error on my Maytag washer?
Start by unplugging the washer for one minute and restarting it. If the error clears, monitor the machine for recurrence. If T-05 comes back, inspect the wiring harness connecting the UI board and ACU for loose connections or damage. Persistent faults after wiring checks are corrected typically point to a defective UI board or ACU that will need to be replaced.
How much does it cost to repair a Maytag washer showing T-05?
If the fix is simply a power cycle or a reseated wiring connector, there is no parts cost involved. If a UI board replacement is needed, parts and labor typically range from around 150 to 300 dollars depending on the specific model and local labor rates. An ACU replacement can cost more, generally in the range of 200 to 400 dollars or higher, making professional diagnosis worthwhile before ordering components.

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