Thermador Refrigerator Error Code 3-4-2

Error code 3-4-2 on a Thermador refrigerator indicates an internal ice maker fault. This code is specific to the ice maker module itself, meaning the control logic within the ice maker assembly has detected a condition it cannot resolve through normal operation. Unlike sensor faults or temperature-related codes that point to external components, this code originates from within the ice maker unit, suggesting a failure in its internal circuitry, motor, or control board.

The ice maker in these units is a self-contained assembly that manages its own harvest cycle, water fill timing, and ice ejection. When the internal logic detects an out-of-range condition, such as a stalled harvest motor, a failed thermistor within the module, or a control board malfunction inside the assembly, it reports a fault back to the main refrigerator control system. Because the fault is classified as internal, external wiring and water supply components are typically not the primary suspects.

The recommended first diagnostic step is a power cycle: switch the refrigerator off completely and then back on. If the 3-4-2 code clears and does not return, the fault may have been a transient control error. However, if the code reappears after the power cycle, the ice maker assembly itself is considered faulty and should be replaced as a complete unit. Attempting to repair individual internal components of the ice maker module is generally not supported, as the assembly is designed for replacement rather than component-level repair.