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Error code reference

Bosch Refrigerator Error Code 3-2-4

Ice maker

Bosch codesBosch refrigerator codes

Ice maker: Ice tray heater is faulty.

First step from the service manual

Switch appliance off and on; if fault persists, heater not replaceable, replace ice maker.

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

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What 3-2-4 means on a Bosch refrigerator

Error code 3-2-4 on a Bosch refrigerator indicates a fault with the ice tray heater inside the ice maker assembly. The ice tray heater is a resistive heating element that warms the underside of the ice mold just enough to release formed ice cubes during the harvest cycle. Without this heater functioning correctly, ice cubes cannot be ejected from the tray, causing the ice maker to stall or stop producing ice entirely. The control board detects the fault by monitoring the heater circuit and flags 3-2-4 when it receives an out-of-range signal, indicating an open circuit, a short, or a complete heater failure.

The ice tray heater is integrated into the ice maker unit itself and is not available as a standalone replacement component. This means that if the fault persists after a power cycle, the entire ice maker assembly must be replaced. Causes can include heater element burnout from age or thermal stress, an internal wiring break within the assembly, or a failed connection between the heater and the ice maker control board. Because the heater is not serviceable on its own, there is no practical path to repair the element in isolation.

Source: manufacturer service documentation.

Common causes of 3-2-4

  1. 01

    Burned-out ice tray heater element

    Part replacement

    The resistive heating element inside the ice maker has failed due to age or thermal stress, breaking the circuit. This is the most likely cause of the 3-2-4 fault and results in a no-harvest condition.

  2. 02

    Internal wiring break within the ice maker assembly

    Part replacement

    A wire or connector inside the ice maker unit may have fractured or corroded, interrupting power to the heater. Since internal wiring is not separately serviceable, this also requires full ice maker replacement.

  3. 03

    Failed heater-to-control-board connection

    Wiring / connection

    The connection between the ice tray heater circuit and the ice maker's internal control board can fail, causing the board to read the heater as open or faulted. Inspect the wiring harness connector at the ice maker for corrosion or looseness before condemning the unit.

  4. 04

    Temporary control board communication glitch

    Wiring / connection

    Occasionally a transient electrical event can cause the control board to log a false fault. Performing a power cycle by switching the appliance off and back on may clear the code if no actual heater failure is present.

See the test procedure for each cause

Frequently asked questions about 3-2-4

What does 3-2-4 mean on a Bosch refrigerator?
Error code 3-2-4 on a Bosch refrigerator indicates that the ice tray heater inside the ice maker is faulty. This heater is responsible for warming the ice mold so that formed cubes can be released during the harvest cycle. When the control board detects an out-of-range signal from the heater circuit, it logs this code and halts normal ice making. Because the heater is not replaceable on its own, the full ice maker assembly typically needs to be replaced.
Will resetting my Bosch refrigerator clear the 3-2-4 error code?
Switching the appliance off and back on is the recommended first step and may clear the code if the fault was caused by a temporary glitch. However, if the 3-2-4 code returns after the power cycle, the ice tray heater has genuinely failed and the error will not clear until the ice maker assembly is replaced.
Can I fix the 3-2-4 error myself without replacing the ice maker?
You can check the wiring harness connector at the ice maker for any obvious corrosion or looseness, since a poor connection can sometimes trigger this fault. Beyond that, the ice tray heater is not a separately replaceable component, so there is no way to repair the heater element itself. If the connector and wiring look intact and the fault persists, replacing the complete ice maker assembly is the only repair path.
Is it safe to continue using my refrigerator while the 3-2-4 code is active?
Yes, the refrigerator's cooling and food preservation functions are not affected by this error code. The 3-2-4 fault is isolated to the ice maker circuit, so the appliance remains safe to use for storing food. You will simply not receive ice from the ice maker until the assembly is repaired or replaced.
How much does it cost to fix a Bosch refrigerator with a 3-2-4 error code?
Since the fault requires replacing the entire ice maker assembly, costs typically include both the part and labor. Ice maker assemblies for Bosch refrigerators generally range from around 100 to 300 dollars depending on the model, and professional installation labor can add 80 to 200 dollars on top of that. A service call diagnostic fee may also apply if you hire a technician to confirm the fault before ordering parts.

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