Bosch Refrigerator Error Code F33

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.

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.

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.

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.

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.