mypros+
Error code reference

Bosch Refrigerator Error Code F33

Compartment sensor in the ice maker is interrupted (open circuit).

Bosch codesBosch refrigerator codes

Compartment sensor in the ice maker 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.

MyPros+ Max

Get the full diagnostic procedure for F33.

  • 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
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What F33 means on a Bosch refrigerator

The F33 error code on a Bosch refrigerator indicates an open circuit condition in the compartment temperature sensor located within the ice maker assembly. An open circuit means the sensor's electrical path is completely broken, preventing the control electronics module from receiving any temperature signal from the ice maker compartment. Without this feedback, the refrigerator cannot properly regulate ice maker operation or monitor compartment conditions.

The compartment sensor in the ice maker is a thermistor-based component, meaning its resistance changes predictably with temperature. When the circuit is interrupted, the electronics module reads infinite resistance rather than a value within the expected operating range. This open circuit condition can stem from a physically broken sensor element, a disconnected or damaged wiring harness, corroded connector terminals, or a failure at the point where the supply cable meets the electronics module.

The primary diagnostic approach involves inspecting the sensor itself and tracing the supply cable along its entire run from the ice maker compartment back to the electronics module. Connector pins should be checked for corrosion, bent terminals, or loose seating. The sensor element can be tested with a multimeter for continuity and resistance. If the wiring and connectors check out, the sensor itself is likely faulty and requires replacement to restore proper communication with the control board.

Source: manufacturer service documentation.

Common causes of F33

  1. 01

    Faulty or broken ice maker compartment sensor

    Part replacement

    The thermistor sensor itself may have failed internally, resulting in an open circuit. Testing the sensor with a multimeter for continuity and proper resistance will confirm whether the component has failed.

  2. 02

    Damaged or disconnected supply cable

    Wiring / connection

    The wiring harness running from the ice maker sensor to the electronics module may be cut, pinched, or disconnected. Inspect the full cable run visually and test for continuity between the sensor connector and the module connector.

  3. 03

    Corroded or loose connector terminals

    Wiring / connection

    Moisture in the ice maker area can cause connector pins to corrode or loosen over time, breaking the electrical circuit. Inspect all connector terminals along the sensor cable for discoloration, oxidation, or poor seating.

  4. 04

    Connector pulled loose from the electronics module

    Wiring / connection

    Vibration or service work may have caused the sensor supply cable to unseat from its connector port on the electronics module. Check that the cable is firmly and fully seated at the module end.

  5. 05

    Failed electronics module

    Part replacement

    If the sensor and all wiring test within acceptable parameters, the electronics module itself may have a faulty input circuit for the ice maker sensor. This is the least common cause and should be diagnosed only after ruling out sensor and wiring issues.

See the test procedure for each cause

Frequently asked questions about F33

What does F33 mean on a Bosch refrigerator?
F33 indicates that the compartment temperature sensor in the ice maker has an open circuit, meaning the electrical connection between the sensor and the electronics module is broken. The refrigerator cannot read the temperature in the ice maker compartment when this fault is active. It is triggered when the module detects no valid signal from the sensor, which typically points to a failed sensor, damaged wiring, or a loose or corroded connector.
Can I fix the F33 error on my Bosch refrigerator myself?
A knowledgeable DIYer can attempt to diagnose F33 by visually inspecting the ice maker sensor and its wiring harness for visible damage, disconnection, or corrosion at the connectors. Using a multimeter to check continuity and resistance along the sensor circuit is also within reach for someone comfortable with basic electrical testing. However, if the sensor or electronics module needs replacement, some experience with appliance disassembly is recommended to avoid further damage.
Is it safe to keep using my refrigerator when F33 is displayed?
The refrigerator's main cooling function may continue to operate while F33 is active, but the ice maker compartment is running without temperature feedback to the control system. This means ice production may be unreliable or stop entirely. It is best to address the fault promptly to prevent potential issues with the ice maker and to restore normal monitored operation.
How much does it cost to repair a Bosch refrigerator F33 error?
Repair costs depend on the root cause. If only a connector needs reseating or cleaning, the cost may be limited to a service call fee, typically in the range of $75 to $150. A replacement ice maker compartment sensor generally costs between $20 and $60 for the part, with additional labor charges if a technician performs the work. An electronics module replacement is the most expensive scenario, often ranging from $150 to $400 or more for parts and labor.
Will resetting my Bosch refrigerator clear the F33 error code?
A reset may temporarily clear the F33 code from the display, but the error will return if the underlying open circuit condition in the ice maker sensor or its wiring has not been resolved. Resetting without repairing does not fix the broken electrical path and is not a substitute for proper diagnosis. The fault should be fully diagnosed and the sensor or wiring corrected to prevent the code from recurring.

Related Bosch refrigerator codes

All Bosch refrigerator codes
View all 209 Bosch refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass