Bosch Refrigerator Error Code 3-4-5

Error code 3-4-5 on a Bosch refrigerator indicates an internal ice maker fault. This code points specifically to a failure originating within the ice maker module itself rather than an external supply issue such as water inlet problems or temperature faults in the main refrigerator compartment. The ice maker assembly contains several integrated components including a harvest thermostat, a drive motor, a heating element for cycle initiation, and a control board. When the refrigerator's main controller detects an abnormal signal or no response from the ice maker module, it logs this fault code.

Because the fault is described as internal to the ice maker, the root cause is typically an electronic or electromechanical failure within the module assembly. Individual subcomponents such as the harvest motor or the internal thermostat may fail, but since the ice maker is largely a sealed or integrated unit on Bosch models, the standard diagnostic pathway skips individual subcomponent testing and moves directly toward module replacement. The first recommended step is a power cycle, switching the appliance fully off and back on, which allows the ice maker's internal logic to reset. If the fault code returns after the power cycle, the ice maker assembly requires replacement. This approach reflects the integrated design of the module, where component-level repair is not typically feasible in the field.