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Error code reference

Thermador Refrigerator Error Code 3-4-5

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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What 3-4-5 means on a Thermador refrigerator

Error code 3-4-5 on a Thermador refrigerator signals an internal ice maker fault. This code is generated when the ice maker's onboard control logic detects an operating condition it cannot resolve on its own. The fault is classified as internal because it originates within the ice maker module itself, as opposed to external factors like water supply pressure or ambient temperature. The ice maker assembly in these units contains its own processor, sensors, and motor drive circuitry, any of which can produce this fault when they fall outside acceptable operating parameters.

The most common triggers for this fault include a failed ice maker motor, a seized or jammed ice ejector mechanism, a defective internal thermistor, or a failure on the ice maker's control board. Because the fault is flagged as internal, the diagnostic path is intentionally short: a power cycle is the first step to rule out a transient software or sensor glitch. If cycling power clears the code and normal ice production resumes, no further action is needed. However, if the fault reappears after the appliance restarts, the ice maker module has a confirmed hardware failure and the entire assembly requires replacement. Individual sub-components of the ice maker are generally not serviceable as separate parts in this context.

Source: manufacturer service documentation.

Common causes of 3-4-5

  1. 01

    Ice maker control board failure

    Part replacement

    The internal circuit board within the ice maker module can fail due to power surges or component aging, causing the module to report an unrecoverable fault. A persistent 3-4-5 code after a power cycle strongly points to this as the root cause.

  2. 02

    Ice ejector motor failure

    Part replacement

    The motor that drives the ejector arms can seize or burn out, preventing the ice maker from completing its harvest cycle. You may notice no ice being produced or hear the unit attempting to cycle without success.

  3. 03

    Internal thermistor fault

    Part replacement

    The ice maker relies on an internal thermistor to monitor temperature and time its freeze and harvest cycles. A failed or out-of-range thermistor can trigger an internal fault code even when the rest of the refrigerator is cooling normally.

  4. 04

    Transient software or sensor glitch

    Wiring / connection

    Occasionally a temporary voltage fluctuation or communication error can cause the ice maker to log a fault code without any underlying hardware failure. Powering the appliance off and on is the first step to rule this out.

  5. 05

    Jammed or seized ice maker mechanism

    Wiring / connection

    Ice buildup or a physical obstruction in the ejector assembly can lock up the mechanism and cause the module to register an internal fault. Inspect the ice maker tray and ejector arms for visible ice bridges or foreign objects before replacing the unit.

See the test procedure for each cause

Frequently asked questions about 3-4-5

What does 3-4-5 mean on a Thermador refrigerator?
Error code 3-4-5 on a Thermador refrigerator indicates an internal ice maker fault. The code means the ice maker module has detected a problem within its own components that it cannot self-correct. This is distinct from water supply or temperature faults, as the failure originates inside the ice maker assembly itself. The recommended first step is a power cycle, and if the code returns, the ice maker must be replaced.
Will resetting my Thermador refrigerator clear the 3-4-5 error code?
A power cycle, turning the appliance off and back on, is the first recommended diagnostic step for error code 3-4-5. If the fault was caused by a temporary glitch in the ice maker's control logic, the reset may clear it permanently. However, if the code reappears after the refrigerator restarts, the ice maker has a confirmed hardware failure and resetting will not resolve the underlying problem.
How do I fix error code 3-4-5 on my Thermador refrigerator?
Start by switching the refrigerator off, waiting a few minutes, and turning it back on. If the 3-4-5 code does not return, the issue was a transient fault and no repair is needed. If the code comes back, the ice maker assembly requires replacement. Also check the ice maker tray and ejector arms for any ice jams or obstructions before ordering a replacement part.
Is error code 3-4-5 on a Thermador refrigerator a safety concern?
Error code 3-4-5 is specific to the ice maker and does not affect the refrigerator or freezer cooling systems. Your food storage compartments will continue to operate normally during this fault. The code is not associated with any electrical or fire hazard, so the appliance is safe to use while you arrange a repair, though ice production will be stopped.
How much does it cost to repair a Thermador refrigerator showing error code 3-4-5?
Because error code 3-4-5 typically requires replacing the ice maker assembly, repair costs generally fall in the range of $150 to $400 or more depending on the specific model, the cost of the replacement ice maker module, and whether you hire a technician or perform the replacement yourself. Labor charges from an appliance repair professional can add $100 to $200 to the total. Getting a model-specific parts quote before committing to the repair is recommended.

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