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Error code reference

Thermador Refrigerator Error Code 3-4-3

Icemaker

Thermador codesThermador refrigerator codes

Icemaker: Internal ice maker fault.

First step from the service manual

Switch the appliance off and on; if fault code reappears, replace the ice maker.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What 3-4-3 means on a Thermador refrigerator

Error code 3-4-3 on a Thermador refrigerator indicates an internal ice maker fault. This code points specifically to a failure within the ice maker module itself, rather than an external component like the water inlet valve or freezer temperature. The ice maker assembly contains its own control board, motor, thermostat, and sensor circuitry, and a fault in any of these internal elements can trigger this code. When the refrigerator's main control detects that the ice maker is not completing its harvest cycle, reporting incorrect sensor data, or failing to respond to commands, it logs this error.

The diagnostic approach begins with a power cycle, switching the appliance fully off and back on, to rule out a transient electronic glitch or communication error between the main board and the ice maker module. If the code clears and does not return, normal operation can resume. However, if the 3-4-3 code reappears after the reset, the internal fault is persistent and the ice maker assembly must be replaced. Unlike faults caused by water supply or temperature issues, an internal ice maker fault is not typically resolved by adjusting settings or cleaning components. The self-contained nature of the failure means the entire ice maker unit is the most practical and recommended replacement target.

Source: manufacturer service documentation.

Common causes of 3-4-3

  1. 01

    Failed ice maker control board

    Part replacement

    The internal control board within the ice maker module governs the harvest cycle and sensor communication. A failed board will produce a persistent internal fault code that a power reset cannot clear.

  2. 02

    Defective ice maker thermostat or temperature sensor

    Part replacement

    The ice maker relies on an internal thermostat or sensor to determine when ice is ready to harvest. If this component fails or reports an out-of-range reading, the module registers an internal fault.

  3. 03

    Ice maker motor or drive mechanism failure

    Part replacement

    The motor that rotates the ejector arms or drives the harvest mechanism can seize or burn out. A stalled or unresponsive motor will cause the ice maker to report an internal fault condition.

  4. 04

    Transient electronic glitch

    Wiring / connection

    A temporary communication error or voltage fluctuation can occasionally trigger a false 3-4-3 code. A full power cycle resolves this in some cases, and the code does not return.

  5. 05

    Ice maker wiring harness damage

    Wiring / connection

    Damaged or corroded wiring within the ice maker assembly can interrupt internal signal paths and mimic a component fault. Inspect the harness connectors for corrosion, breaks, or loose terminals before replacing the entire module.

See the test procedure for each cause

Frequently asked questions about 3-4-3

What does 3-4-3 mean on a Thermador refrigerator?
Error code 3-4-3 indicates an internal ice maker fault on a Thermador refrigerator. The code means the refrigerator's control system has detected a failure originating inside the ice maker module itself. This is distinct from external issues like water supply problems or freezer temperature faults. If a power cycle does not clear the code, the ice maker assembly requires replacement.
Will resetting my Thermador refrigerator clear the 3-4-3 error code?
A power cycle, turning the appliance off and back on, is the correct first step for a 3-4-3 error. If the fault was caused by a temporary electronic glitch, the reset will clear it and normal ice production will resume. However, if the internal fault is mechanical or electronic in nature, the code will reappear and a reset alone will not resolve the problem.
How do I fix error code 3-4-3 on a Thermador refrigerator?
Start by switching the refrigerator off completely and then back on. If the 3-4-3 code does not return, the issue was a transient fault and no further action is needed. If the code comes back, the ice maker assembly must be replaced, as the fault is internal to the module and is not serviceable through adjustments or cleaning alone.
Is it safe to keep using my Thermador refrigerator when the 3-4-3 code is active?
An active 3-4-3 fault means the ice maker is not functioning properly, but it does not typically affect the refrigerator's cooling or food preservation functions. The refrigerator and freezer compartments should continue to operate normally. You can safely continue using the appliance for food storage while scheduling a repair, but ice production will be unreliable or completely stopped until the ice maker is replaced.
How much does it cost to repair a Thermador refrigerator with a 3-4-3 error?
Because the 3-4-3 error requires replacing the ice maker assembly in most cases, repair costs will include both the part and labor. Ice maker assemblies for Thermador refrigerators typically range from $150 to $400 depending on the specific model. Professional labor to diagnose and install the component generally adds $100 to $250, bringing total repair costs to a range of roughly $250 to $650.

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