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Error code reference

Bosch Refrigerator Error Code 3-4-4

Ice maker

Bosch codesBosch refrigerator codes

Ice maker: Internal ice maker fault.

First step from the service manual

Switch appliance off and on; if fault persists, replace ice maker.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What 3-4-4 means on a Bosch refrigerator

Error code 3-4-4 on a Bosch refrigerator indicates an internal ice maker fault. This code points to a failure within the ice maker unit itself rather than an external supply issue such as water line pressure or inlet valve operation. The ice maker assembly contains several integrated components including a motor, thermostat, heating element for harvest cycles, and a control module. When the refrigerator's main control board detects an abnormal signal or loss of communication from the ice maker's internal circuitry, it logs this fault code.

The term "internal" fault distinguishes this error from peripheral issues like a frozen water line or a clogged filter. It suggests the ice maker's own electronics or electromechanical components have failed in a way that cannot be corrected by normal operation. Common internal failures include a seized harvest motor, a failed thermostat within the ice maker head, or a defective ice maker control board. These components are generally not serviceable individually, making the ice maker assembly the typical replacement unit.

The first recommended diagnostic step is a power cycle: switching the appliance fully off and then back on. This clears any transient fault that may have been logged due to a momentary voltage fluctuation or software glitch. If the 3-4-4 code returns after the power cycle, the fault is persistent and the ice maker assembly requires replacement. Continuing to run the appliance with a persistent internal ice maker fault will not damage other refrigerator systems, but ice production will remain non-functional.

Source: manufacturer service documentation.

Common causes of 3-4-4

  1. 01

    Failed ice maker control module

    Part replacement

    The internal control board within the ice maker assembly can fail due to age, moisture exposure, or electrical stress. This is the most frequent cause of a persistent internal fault code and typically requires full ice maker replacement.

  2. 02

    Seized or failed harvest motor

    Part replacement

    The motor that rotates the ice ejector arms can seize or burn out, causing the ice maker to detect an internal drive fault. If the ejector arms are not turning during a harvest cycle, the motor is likely the culprit.

  3. 03

    Defective ice maker thermostat

    Part replacement

    The thermostat integrated into the ice maker head monitors temperature to control the freeze and harvest cycle. If it fails open or short, the control board registers an internal fault. This component is typically not replaceable separately from the ice maker assembly.

  4. 04

    Transient electrical or software glitch

    Wiring / connection

    A momentary power fluctuation or firmware hiccup can occasionally trigger a false internal fault code. A full power cycle, turning the unit off and back on, is the diagnostic step to rule this out before replacing any parts.

  5. 05

    Failed ice maker heating element

    Part replacement

    The harvest heater inside the ice maker loosens ice from the mold during each cycle. If this element fails, the ice maker may lock up and log an internal fault. Like the thermostat, this component is generally integral to the ice maker assembly.

See the test procedure for each cause

Frequently asked questions about 3-4-4

What does 3-4-4 mean on a Bosch refrigerator?
Error code 3-4-4 on a Bosch refrigerator indicates an internal ice maker fault. This means the refrigerator's control system has detected a failure within the ice maker unit itself, such as a problem with the harvest motor, internal thermostat, heating element, or ice maker control module. The fault is specific to the ice maker assembly and does not affect other refrigerator functions. If a power cycle does not clear the code, the ice maker assembly typically needs to be replaced.
Will resetting my Bosch refrigerator clear the 3-4-4 error code?
A power cycle, turning the refrigerator fully off and then back on, is the recommended first step and may clear the code if the fault was caused by a temporary electrical glitch. However, if the 3-4-4 code reappears after the reset, the fault is persistent and indicates a hardware failure inside the ice maker. In that case, resetting alone will not resolve the problem and the ice maker unit will need to be replaced.
Is it safe to keep using my refrigerator while the 3-4-4 code is active?
Yes, the 3-4-4 fault is isolated to the ice maker system and does not affect the refrigerator's cooling or freezing performance. Your food will remain safely refrigerated and frozen while this code is present. The only loss of function is ice production. You can continue using the refrigerator normally while you arrange for diagnosis or parts.
How do I fix the 3-4-4 error code on my Bosch refrigerator?
Start by turning the refrigerator off and back on to perform a power cycle. If the code clears and does not return, no further action is needed. If the 3-4-4 code persists after the power cycle, the ice maker assembly requires replacement. The internal components such as the harvest motor, thermostat, and control module are not typically serviceable individually, so the entire ice maker head is replaced as a unit.
How much does it cost to fix a 3-4-4 error code on a Bosch refrigerator?
If a power cycle does not resolve the fault, the primary repair involves replacing the ice maker assembly. Parts costs for a Bosch ice maker unit typically range from $80 to $250 depending on the specific model. If you hire a technician, labor charges will add to that cost, bringing the total repair estimate to a range of roughly $150 to $450. Getting a diagnosis from a qualified technician can confirm the fault before purchasing parts.

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