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Error code reference

Bosch Refrigerator Error Code E02

FC (Freezer Compartment) room temperature sensor reading out of range (≥60°C or ≤-55°C), indicating sensor…

Bosch codesBosch refrigerator codes

FC (Freezer Compartment) room temperature sensor reading out of range (≥60°C or ≤-55°C), indicating sensor break, short-circuit, or no contact.

First step from the service manual

Check freezer compartment sensor for break/short-circuit/no contact.

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
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What E02 means on a Bosch refrigerator

The E02 error code on a Bosch refrigerator indicates that the freezer compartment (FC) room temperature sensor is returning a reading that falls outside the acceptable operating range. Specifically, the control board flags this fault when the sensor reports a temperature at or above 60°C or at or below -55°C. Because neither extreme is a realistic freezer condition under normal operation, the control board interprets these readings as a sensor malfunction rather than an actual temperature event.

The freezer compartment temperature sensor is a negative temperature coefficient (NTC) thermistor, meaning its electrical resistance changes predictably as temperature changes. When the sensor circuit is open (broken wire or failed sensor), the control board reads an abnormally high resistance value, which it interprets as an extremely low temperature. Conversely, a short circuit drives resistance toward zero, producing a signal the board reads as an extremely high temperature. A loose or corroded connector can cause intermittent readings that also push outside the valid range.

Diagnosing E02 requires physically inspecting the sensor and its wiring harness in the freezer compartment. Check the sensor body for visible damage, inspect the connector pins for corrosion or bent contacts, and verify continuity through the wiring harness. If the wiring is intact, measuring the sensor resistance at a known temperature and comparing it to the expected NTC curve will confirm whether the sensor itself has failed and needs replacement.

Source: manufacturer service documentation.

Common causes of E02

  1. 01

    Failed or broken temperature sensor

    Part replacement

    The NTC thermistor in the freezer compartment can fail internally, causing an open circuit that the control board reads as an out-of-range temperature. Testing resistance across the sensor terminals will show an open circuit or a value far outside the expected range.

  2. 02

    Loose or disconnected sensor connector

    Wiring / connection

    The sensor connector can vibrate loose or pull away from its socket over time, interrupting the signal to the control board. Inspecting the connector at both the sensor end and the harness end for proper seating will identify this issue.

  3. 03

    Corroded or damaged connector pins

    Wiring / connection

    Moisture inside the freezer compartment can cause the sensor connector pins to corrode, increasing resistance or breaking continuity entirely. Visually inspect the pins for green or white oxidation and clean or replace the connector as needed.

  4. 04

    Damaged wiring harness

    Part replacement

    The wiring between the sensor and the control board can be pinched, cut, or broken, particularly where the harness routes through a door hinge or cabinet panel. A continuity check along the full harness length will reveal any break.

  5. 05

    Short circuit in the sensor circuit

    Part replacement

    If two wires in the sensor circuit contact each other or a grounded surface, the resistance drops to near zero and the control board reads an extreme high-temperature value. Inspecting the harness for chafed insulation or pinch points will help locate a short.

See the test procedure for each cause

Frequently asked questions about E02

What does E02 mean on a Bosch refrigerator?
E02 means the freezer compartment temperature sensor is reporting a value outside the valid operating range, specifically at or above 60°C or at or below -55°C. Because these readings are not physically possible under normal conditions, the control board treats the signal as a fault. The most common causes are a failed sensor, a disconnected connector, or a wiring problem in the sensor circuit.
Can I fix the E02 error myself?
A knowledgeable DIYer can often resolve E02 by checking the sensor connector for proper seating, inspecting the wiring harness for visible damage, and testing sensor resistance with a multimeter. If the sensor itself has failed, replacing it is a straightforward repair that involves unplugging the old sensor and plugging in a compatible replacement. If the wiring harness is damaged, repairs may be more involved and could warrant professional service.
Will resetting the refrigerator clear the E02 error code?
A power reset may temporarily clear the E02 display, but the code will return as soon as the control board reads the sensor signal again and detects it is still out of range. The underlying sensor, connector, or wiring issue must be corrected for the fault to clear permanently. Resetting without repairing is not a solution and can leave the freezer running without reliable temperature control.
Is it safe to keep using my refrigerator while E02 is displayed?
Continuing to run the refrigerator with an active E02 code is not recommended because the control board cannot verify the actual freezer temperature, which means it may not regulate cooling correctly. Food stored in the freezer could be at risk if the system overcools or fails to maintain safe temperatures. It is best to address the fault promptly and keep freezer contents in a backup cooler if the repair cannot be completed quickly.
How much does it cost to repair the E02 error on a Bosch refrigerator?
If only the temperature sensor needs replacement, parts typically cost in the range of $15 to $60 depending on the specific model, and the repair is often a straightforward DIY job. If a technician is needed, labor charges generally add $80 to $200 to the total cost. Wiring harness repairs or control board diagnostics can push the overall cost higher if the initial sensor inspection does not reveal the cause.

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