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Error code reference

Bosch Refrigerator Error Code 2-2-1

Ice maker

Bosch codesBosch refrigerator codes

Ice maker: Sensor fault in ice maker.

First step from the service manual

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

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

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What 2-2-1 means on a Bosch refrigerator

Error code 2-2-1 on a Bosch refrigerator indicates a sensor fault within the ice maker unit. The ice maker contains an integrated temperature sensor that monitors conditions inside the ice-making module to regulate the freeze and harvest cycles. When the control board detects that this sensor is returning a signal outside of its expected parameters, whether an open circuit, a short, or an out-of-range resistance value, it logs the 2-2-1 fault and may suspend ice production to prevent damage or unsafe operation.

The sensor responsible for this fault is not a separately serviceable component. It is integrated directly into the ice maker assembly, meaning it cannot be tested or swapped out on its own. If the fault persists after a power cycle, the entire ice maker module must be replaced. Common triggers include a failed sensor element inside the module, wiring harness damage between the ice maker and the control board, or a connector that has corroded or worked loose over time. In some cases, a transient electronic glitch can cause a false fault, which is why the first diagnostic step is a power reset before committing to parts replacement.

Source: manufacturer service documentation.

Common causes of 2-2-1

  1. 01

    Failed integrated ice maker sensor

    Part replacement

    The temperature sensor inside the ice maker module has failed electrically, producing a reading outside the expected range. Because the sensor is not replaceable separately, the entire ice maker unit must be swapped out.

  2. 02

    Loose or disconnected wiring connector

    Wiring / connection

    The connector linking the ice maker harness to the refrigerator's main wiring loom can loosen over time, causing an intermittent or open circuit that mimics a sensor fault. Inspect the connector at the ice maker for proper seating and signs of backing out.

  3. 03

    Corroded or damaged wiring harness

    Part replacement

    Moisture in the freezer compartment can corrode the terminals on the ice maker wiring harness, increasing resistance and causing the control board to read a fault. Look for green or white oxidation on the connector pins or visible wire damage near the ice maker.

  4. 04

    Transient electronic glitch

    Wiring / connection

    A temporary voltage fluctuation or software hiccup can occasionally trigger a false 2-2-1 fault. A full power cycle, turning the appliance off, waiting several minutes, and restarting it, can clear the error if no physical fault is present.

See the test procedure for each cause

Frequently asked questions about 2-2-1

What does 2-2-1 mean on a Bosch refrigerator?
Error code 2-2-1 on a Bosch refrigerator signals a sensor fault within the ice maker unit. The ice maker contains an integrated temperature sensor that the control board monitors continuously. When that sensor produces a reading outside its acceptable range, or no reading at all, the 2-2-1 code is triggered and ice production may stop. Because the sensor is built into the ice maker assembly, it cannot be replaced on its own.
Will resetting my Bosch refrigerator clear the 2-2-1 error code?
A power reset is always the recommended first step for a 2-2-1 fault. Turn the refrigerator off, wait a few minutes, and turn it back on to allow the control board to re-initialize. If the error clears and does not return, a transient glitch was likely the cause. If the code comes back after the reset, a physical component failure is present and the ice maker assembly will need to be replaced.
Is it safe to keep using my refrigerator while error code 2-2-1 is active?
The refrigerator's cooling system for fresh food and freezer compartments typically continues to operate normally during a 2-2-1 fault, so food safety is generally not an immediate concern. However, the ice maker may stop producing ice until the fault is resolved. It is best to address the issue promptly to avoid extended disruption to ice production and to prevent any underlying wiring issue from worsening.
Can I replace just the sensor to fix a 2-2-1 fault on a Bosch refrigerator?
No. The temperature sensor that triggers the 2-2-1 code is integrated directly into the ice maker module and is not available as a standalone replacement part. If the fault persists after a power cycle and the wiring connections are confirmed to be secure and undamaged, the complete ice maker assembly must be replaced to resolve the error.
How much does it cost to fix a Bosch refrigerator showing error code 2-2-1?
If only a power reset or a wiring connector reseating is needed, there may be no parts cost at all. If the ice maker assembly must be replaced, parts alone typically range from $80 to $250 depending on the specific Bosch model. Adding professional labor, most repair visits run between $150 and $400 in total, though prices vary by region and service provider.

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