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Error code reference

Cove Dishwasher Error Code 900112

MCM

Cove codesCove dishwasher codes

MCM: UIM slave firmware not compatible.

First step from the service manual

Replace the UIM.

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

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What 900112 means on a Cove dishwasher

Error code 900112 on a Cove dishwasher indicates a firmware incompatibility between the Master Control Module (MCM) and the User Interface Module (UIM). The UIM operates as a slave device on the appliance's internal communication bus, meaning it receives commands and synchronization signals from the MCM. When the MCM detects that the UIM's installed firmware version does not match the expected protocol or version range, it throws this error to prevent unpredictable behavior or unsafe operation.

This type of error most commonly appears after a partial or failed firmware update, or when a replacement UIM is installed with a firmware version that does not align with the MCM currently in the machine. The two modules must run compatible firmware builds to communicate correctly over the control bus. If the handshake or version check fails during initialization, the dishwasher will halt and display code 900112 rather than proceed with a potentially miscommunicated cycle.

The primary corrective action is replacement of the UIM, which typically resolves the incompatibility by installing a unit with current, compatible firmware. In some cases, a replacement UIM may also need a firmware update before the MCM will accept it. If a new UIM does not resolve the error, the MCM itself may be the source of an outdated or corrupted firmware version, and further diagnosis of that module would be warranted.

Source: manufacturer service documentation.

Common causes of 900112

  1. 01

    UIM with incompatible firmware version

    Part replacement

    The User Interface Module installed in the dishwasher is running a firmware version the MCM does not recognize or support. This is the most direct cause of code 900112 and is confirmed by the error itself.

  2. 02

    Failed or interrupted firmware update

    Wiring / connection

    If a firmware update was interrupted by a power loss or communication fault, the UIM may be left with a corrupted or partial firmware build that the MCM rejects on startup.

  3. 03

    Recently installed replacement UIM

    Part replacement

    A replacement UIM sourced with an older or newer firmware version than what the existing MCM expects will trigger this incompatibility error immediately upon installation.

  4. 04

    MCM firmware mismatch

    Part replacement

    If the MCM itself was updated or replaced and now expects a newer UIM firmware version than what is installed, the communication check will fail and generate this code.

  5. 05

    Communication wiring fault between MCM and UIM

    Wiring / connection

    Damaged or loose wiring on the control bus between the MCM and UIM can cause garbled version handshakes, mimicking a firmware incompatibility even when both modules are otherwise correct.

See the test procedure for each cause

Frequently asked questions about 900112

What does 900112 mean on a Cove dishwasher?
Error code 900112 means the Master Control Module detected that the User Interface Module's firmware is not compatible with its own. The MCM and UIM must run matching firmware versions to communicate correctly. The dishwasher stops operation and displays this code rather than run a cycle with mismatched control software.
Will resetting my Cove dishwasher clear error code 900112?
A simple reset will not permanently clear code 900112 because the error is caused by a fundamental firmware incompatibility between the MCM and UIM. The modules will fail the same version check on every startup until the incompatibility is resolved. Resetting may temporarily clear the display, but the code will return as soon as the machine attempts to initialize.
How do I fix error code 900112 on a Cove dishwasher?
The first recommended step is to replace the UIM with a unit that carries compatible firmware for the installed MCM. If a new UIM does not resolve the error, the wiring harness between the two modules should be inspected for damage or loose connectors. In cases where the MCM firmware is outdated or corrupted, that module may also require attention.
Is it safe to use my Cove dishwasher while error code 900112 is active?
The dishwasher will generally not allow normal operation while this error is active, since the MCM halts the machine when it detects the firmware incompatibility. Attempting to force operation is not recommended. The appliance should remain idle until the UIM or firmware issue is properly resolved by a qualified technician.
How much does it cost to repair error code 900112 on a Cove dishwasher?
Repair costs depend on whether the UIM alone needs replacement or if additional components or firmware service is required. A UIM replacement on a Cove dishwasher typically falls in the range of $150 to $400 including parts and labor, though costs can vary based on parts availability and local labor rates. If the MCM also requires service, total costs would be higher.

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