Cove Dishwasher Error Code 900107

Error code 900107 means the Machine Control Module (MCM) has detected a firmware incompatibility on its RS-485 internal communication interface. The RS-485 firmware version does not match what the system expects, so the dishwasher stops operating to prevent control errors. This is an electronics-level fault that requires MCM assembly replacement to resolve.

A power cycle or control reset will not clear error 900107. Because the fault is caused by a firmware incompatibility within the MCM hardware itself, the error will return immediately after any reset. The only resolution is replacing the MCM assembly with a compatible unit.

Repair costs for error 900107 depend on the price of the MCM assembly and labor rates in your area. MCM assemblies for premium dishwashers like Cove typically range from $150 to $400 or more for the part alone, with professional labor adding an additional $100 to $250 depending on the service provider. Contacting a Cove-authorized service technician is recommended for an accurate estimate.

This error requires replacing the MCM assembly, which involves working with the dishwasher's main control electronics. While a skilled DIYer comfortable with appliance electronics may be able to perform the swap, sourcing the correct MCM version is critical to avoid reintroducing the same incompatibility. Most homeowners should contact a qualified appliance technician for this repair.

The dishwasher should not be used while this error is active. The RS-485 communication failure means the MCM cannot reliably coordinate with other components in the control system, so normal cycle functions cannot be properly managed. Continued use could lead to unpredictable behavior or additional component issues.