Cove Dishwasher Error Code 900122

Error code 900122 means the Master Control Module (MCM) has detected that the firmware in the User Interface Module (UIM) is not compatible with it. The two boards perform a firmware version check at startup, and this code appears when that check fails. The dishwasher will not run until the incompatibility is resolved. Replacing the UIM is the required corrective step.

No, a power reset will not clear this error. The code is generated because the MCM actively detects a firmware mismatch with the UIM each time it starts up. Since resetting does not change the firmware on either module, the error will return immediately after power is restored. Replacement of the UIM is necessary to resolve it.

The cost depends primarily on the price of the replacement UIM, which for Cove dishwashers typically falls in the range of $150 to $400 depending on the specific model and part availability. If you hire a technician for diagnosis and installation, labor costs will add to the total, generally bringing the full repair into the range of $250 to $600 or more.

Resolving this error requires replacing the UIM, which involves working with the dishwasher's internal control electronics. A knowledgeable DIYer comfortable with appliance disassembly can potentially complete this repair, but sourcing a UIM with the correct firmware version compatible with your specific MCM is critical. If you are unsure which UIM version to order, a qualified technician can confirm compatibility before purchasing parts.

When this error is present, the dishwasher is unable to operate normally because the MCM and UIM cannot communicate in a compatible state. In practice, the unit will not run a wash cycle, so there is no immediate safety hazard. However, the appliance should not be considered functional and the issue should be addressed before attempting to use it.