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Error code reference

Cove Dishwasher Error Code 900182

UIM

Cove codesCove dishwasher codes

UIM: No MCM communications.

First step from the service manual

Disconnect the power cord.

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

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What 900182 means on a Cove dishwasher

Error code 900182 on a Cove dishwasher indicates a communication failure between the User Interface Module (UIM) and the Main Control Module (MCM). The UIM is the control panel assembly that accepts user input and displays cycle status, while the MCM is the primary control board that manages all wash functions, motor operation, water inlet, heating, and drain sequences. These two modules communicate over a data bus, and when the UIM cannot establish or maintain that communication link, code 900182 is triggered and the dishwasher halts operation.

The loss of communication between these two modules is most often caused by a wiring harness fault between the UIM and MCM. Loose connector pins, corroded terminals, pinched wiring, or a partially disconnected harness can interrupt the data signal. Because the dishwasher operates in a humid environment, connector corrosion is a realistic failure point over time. A failed UIM or MCM can also produce this fault if either module has lost the ability to send or receive data signals properly.

The first diagnostic step specified for this code is to disconnect the power cord. This power cycle allows any transient communication errors to clear and gives the technician a safe starting point before inspecting the wiring harness connectors between the two modules. If the fault returns after power is restored, a physical inspection of the data bus wiring and connectors is required, followed by component-level testing of the UIM and MCM to determine which module has failed.

Source: manufacturer service documentation.

Common causes of 900182

  1. 01

    Loose or disconnected wiring harness connector

    Wiring / connection

    The data cable connecting the UIM to the MCM may have worked loose from its connector seat. Inspect both ends of the harness for connectors that are not fully seated or have backed-out pins.

  2. 02

    Corroded or damaged harness terminals

    Part replacement

    Moisture inside the dishwasher door can cause corrosion on the connector terminals between the UIM and MCM, increasing resistance and breaking the communication signal. Look for green or white oxidation on the connector pins.

  3. 03

    Transient power fault or surge

    Wiring / connection

    A brief power interruption or voltage fluctuation can cause the communication link between modules to drop. Disconnecting and restoring power may clear this condition if no physical wiring fault is present.

  4. 04

    Failed User Interface Module (UIM)

    Part replacement

    If the UIM control board has failed internally, it will be unable to communicate with the MCM and will trigger this code. This is suspected when wiring checks out normal but the fault persists.

  5. 05

    Failed Main Control Module (MCM)

    Part replacement

    A defective MCM that has lost its communication capability will also produce this error. If the UIM tests as functional and all wiring is intact, the MCM is the likely failed component.

See the test procedure for each cause

Frequently asked questions about 900182

What does 900182 mean on a Cove dishwasher?
Error code 900182 means the User Interface Module (UIM) cannot communicate with the Main Control Module (MCM). These are the two primary electronic control components in your dishwasher, and they must exchange data continuously for the appliance to operate. The dishwasher shuts down when this communication link is lost. The cause is typically a wiring harness issue or a failure in one of the two modules.
Will resetting the dishwasher clear error code 900182?
Disconnecting the power cord is the recommended first step and may clear the code if the failure was caused by a transient power event. However, if the fault is due to a physical wiring problem, corroded connector, or a failed control board, the code will return after power is restored. A reset alone is not a repair for an underlying hardware fault.
Is it safe to use my Cove dishwasher while error 900182 is active?
No, the dishwasher will not operate normally with this error active because the control modules cannot coordinate machine functions. Attempting to force operation without resolving the communication fault is not recommended. The appliance should remain unplugged until the fault is diagnosed and repaired.
How much does it cost to fix error code 900182 on a Cove dishwasher?
Repair costs vary depending on the root cause. If the fix is simply reseating a connector, the cost is primarily a service call fee, typically in the range of $75 to $150. If a UIM or MCM replacement is needed, parts plus labor can range from $200 to $600 or more depending on part availability and local labor rates.
How do I fix error code 900182 on my Cove dishwasher?
Start by disconnecting the power cord and waiting a few minutes before reconnecting to rule out a transient fault. If the error returns, the next step is a physical inspection of the wiring harness and connector terminals between the UIM and MCM, checking for loose connections or corrosion. If wiring is intact, one or both control modules may need to be tested and replaced. This repair typically requires a qualified appliance technician.

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