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Error code reference

Bosch Refrigerator Error Code F1

Compartment sensor in the refrigerator compartment is interrupted (open circuit).

Bosch codesBosch refrigerator codes

Compartment sensor in the refrigerator compartment is interrupted (open circuit).

First step from the service manual

Check the sensor and the supply cable to the electronics module.

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

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What F1 means on a Bosch refrigerator

The F1 error code on a Bosch refrigerator indicates an open circuit condition in the temperature sensor located inside the refrigerator compartment. This sensor, typically a negative temperature coefficient (NTC) thermistor, continuously sends resistance-based temperature readings to the electronics control module. When the circuit is interrupted, the module receives no valid signal and triggers the F1 fault to indicate the loss of communication with that sensor.

An open circuit in this context means the electrical path between the sensor and the control board has been broken. This can occur at several points: the thermistor itself may have failed internally, the wiring harness connecting the sensor to the electronics module may be damaged or disconnected, or a connector along that cable run may have corroded or pulled loose. Because the refrigerator relies on this sensor to regulate cooling cycles, the compartment may run continuously or fail to cool properly while this fault is active.

Diagnosis should begin at the sensor and its supply cable running to the electronics module, as directed by the fault code definition. A technician can use a multimeter to check continuity through the sensor and along the wiring harness. A functional NTC thermistor will show a measurable resistance value that changes with temperature, while a failed sensor in open circuit will show no continuity at all. Inspecting connectors for corrosion, damage, or loose seating is also a critical part of the diagnostic process.

Source: manufacturer service documentation.

Common causes of F1

  1. 01

    Failed NTC thermistor sensor

    Part replacement

    The thermistor inside the refrigerator compartment has developed an internal open circuit and can no longer transmit temperature data. Testing with a multimeter will show no continuity across the sensor terminals.

  2. 02

    Damaged or broken wiring harness

    Part replacement

    The cable running from the compartment sensor to the electronics module may have been pinched, cut, or worn through, breaking the circuit. Visually inspect the harness along its full length for signs of physical damage.

  3. 03

    Loose or disconnected connector

    Wiring / connection

    A connector along the sensor cable may have pulled free from its socket or become loose over time due to vibration or handling. Reseating the connector can restore the circuit without replacing any parts.

  4. 04

    Corroded connector terminals

    Wiring / connection

    Moisture inside the refrigerator compartment can cause connector pins to corrode, increasing resistance until the circuit effectively opens. Inspect connector terminals for oxidation or discoloration.

  5. 05

    Electronics module fault

    Part replacement

    In less common cases, the control board itself may have a damaged input circuit for the compartment sensor, causing it to read the sensor signal as an open circuit even when the sensor and wiring are intact.

See the test procedure for each cause

Frequently asked questions about F1

What does F1 mean on a Bosch refrigerator?
F1 on a Bosch refrigerator means the temperature sensor in the refrigerator compartment has an open circuit, meaning the signal path between the sensor and the electronics control module is broken. The sensor is responsible for reporting compartment temperature so the fridge can regulate its cooling cycles. This fault will typically cause incorrect or absent cooling in the refrigerator section. The sensor itself, the connecting wiring, or a loose connector are the most likely culprits.
Can I fix the F1 error on my Bosch refrigerator myself?
Some causes of the F1 error, such as a loose or disconnected connector, can be addressed by a knowledgeable DIYer who is comfortable checking wiring connections inside the appliance. However, diagnosing a failed thermistor or damaged harness requires a multimeter and some familiarity with electrical testing. Replacing the sensor or control board is a moderate repair that many experienced DIYers can handle, though professional service is recommended if you are not comfortable working with appliance electronics.
Is it safe to keep using my Bosch refrigerator while the F1 error is active?
Continued use with an active F1 error is not recommended for storing perishable food. Without a functioning compartment sensor, the refrigerator cannot accurately regulate temperature, meaning the compartment may run too warm or cycle improperly. Food safety is at risk if the internal temperature rises above safe levels. Address the fault as promptly as possible.
Will resetting my Bosch refrigerator clear the F1 error code?
A power reset may temporarily clear the displayed error code, but the F1 fault will return as soon as the control module checks the sensor circuit again and detects the open circuit condition. The underlying hardware issue, whether a failed sensor, broken wire, or bad connector, must be repaired before the error will stay cleared permanently.
How much does it cost to repair an F1 error on a Bosch refrigerator?
Repair costs depend on what component has failed. A replacement NTC thermistor sensor is generally an inexpensive part, typically ranging from around $15 to $50 depending on the specific model. If the electronics control module needs replacement, costs rise significantly, often falling in the $150 to $400 range for the part alone. Adding professional labor, total repair costs can range from roughly $100 to $500 or more depending on diagnosis and location.

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