Bosch Refrigerator Error Code 3-4-6

Error code 3-4-6 on a Bosch refrigerator indicates a fault detected in the ice maker's crusher motor. The crusher motor is the component responsible for breaking whole ice cubes into crushed ice when that dispenser mode is selected. When the control board sends a signal to operate the crusher motor and does not receive the expected response, whether due to a lack of movement, abnormal current draw, or an open circuit in the motor winding, it logs this fault code and disables the affected function.

The diagnostic process for this code starts with a direct inspection and test of the crusher motor itself. A technician should check for mechanical binding in the crusher mechanism, inspect the motor's electrical connectors for corrosion or looseness, and verify that the motor windings are not open or shorted. If the motor tests within acceptable parameters and receives proper voltage at the connector, the fault likely originates within the ice maker assembly itself, which contains the control logic that manages motor operation.

If the crusher motor is confirmed faulty through testing, replacing the motor is the appropriate repair. If the motor tests as functional and all wiring connections are secure, the entire ice maker assembly should be replaced, as the internal control board within the unit is likely misreporting or failing to properly command the motor. This two-step diagnostic approach helps isolate the fault to a single replaceable component rather than replacing both parts unnecessarily.