Error code reference

KitchenAid Dishwasher Error Code 1-2

Control software issue

KitchenAid codesKitchenAid dishwasher codes

Control software issue - damaged or corrupted memory on control board, or incompatible software components inside micro.

First step from the service manual

1. Unplug dishwasher or disconnect power. 2. Replace control board.

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

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What 1-2 means on a KitchenAid dishwasher

Error code 1-2 on a KitchenAid dishwasher indicates a control software fault detected within the main control board. Specifically, the microcontroller has identified either damaged or corrupted memory on the board, or a mismatch between software components inside the micro itself. This is an internal firmware-level failure, not a sensor or mechanical issue. The control board runs a self-check during operation, and when memory integrity fails or software components are incompatible, it throws this code and halts normal function.

For homeowners, this means the electronic brain of your dishwasher has detected a problem with its own programming or internal memory. Think of it like a computer that won't boot because its operating system files are corrupted or mismatched. The dishwasher cannot reliably run a wash cycle because the software controlling every function, from water fill to drain timing, cannot be trusted to execute correctly. Unlike a clogged filter or a worn door latch, this is not something you can clean or adjust. The control board itself needs to be replaced. A power reset is worth attempting first, but if the code returns, a new control board is the required fix.

Source: manufacturer service documentation.

Common causes of 1-2

  1. 01

    Corrupted memory on control board

    Part replacement

    The microcontroller's onboard memory has become corrupted, possibly due to a power surge, voltage spike, or component degradation over time. When the board runs its self-diagnostic, it detects that stored data no longer matches expected values and triggers code 1-2.

  2. 02

    Incompatible software components inside the microcontroller

    Part replacement

    Internal firmware components within the micro do not match or communicate correctly with each other, which can occur after a failed software update or if a replacement board was installed with incompatible firmware. The mismatch prevents the control system from initializing properly.

  3. 03

    Physical damage to control board circuitry

    Part replacement

    Moisture intrusion, heat damage, or a failing solder joint on the control board can cause memory read/write errors that the microcontroller interprets as a software or memory fault. Visible burn marks or corrosion on the board often accompany this cause.

See the test procedure for each cause

Frequently asked questions about 1-2

What does error code 1-2 mean on a KitchenAid dishwasher?
Error code 1-2 means the main control board has detected a problem with its own internal memory or software. Either the memory is damaged or corrupted, or there are incompatible software components inside the microcontroller. This is a self-reported firmware or memory fault, not a mechanical or sensor issue. The dishwasher stops operating because it cannot trust its own programming to run cycles correctly.
How do I fix error code 1-2 on a KitchenAid dishwasher?
Start by unplugging the dishwasher or shutting off the circuit breaker for 5 minutes to allow a full power reset. If the code clears and does not return, no further action may be needed. If code 1-2 comes back after restoring power, the main control board must be replaced. This is not a repairable firmware issue in the field since the memory or micro components inside the board itself are the problem.
Can I still use my KitchenAid dishwasher if it is showing error code 1-2?
No, the dishwasher will not complete a normal wash cycle with code 1-2 active. The control board has flagged its own software or memory as unreliable, which means it cannot properly sequence water fill, heating, or draining. Attempting to run cycles in this state could result in incomplete washes or, in a worst case, unpredictable behavior from the control system. The board should be replaced before regular use resumes.
How much does it cost to fix error code 1-2 on a KitchenAid dishwasher?
A replacement KitchenAid dishwasher control board typically costs between $100 and $250 for the part, depending on the model. If you hire a technician, expect to add $100 to $200 in labor, bringing the total repair to roughly $200 to $450. Replacing the control board yourself is a moderate DIY task requiring only basic tools, a compatible replacement board for your specific model number, and comfort working around electrical components with the power disconnected.
Will resetting my KitchenAid dishwasher fix error code 1-2?
A power reset occasionally clears code 1-2 if the fault was caused by a temporary glitch during a power fluctuation. Unplug the dishwasher or turn off the breaker for at least 5 minutes, then restore power and run a test cycle. If the code returns, the control board has a persistent memory or software fault and will need to be replaced. A reset alone will not fix corrupted memory or incompatible firmware components inside the microcontroller.

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