Bosch Refrigerator Error Code r3

The r3 code means the refrigerator compartment defrost cycle did not complete normally. Instead of ending through the defrost termination sensor (RD-S), the cycle ran until the 50-minute safety time limit was reached and was cut off automatically. This points to a problem with the defrost heater, the RD-S termination sensor, or the wiring connecting them to the control board.

A reset may temporarily clear the r3 code from the display, but it will not resolve the underlying fault. If the defrost heater or termination sensor is defective, the error will return the next time a defrost cycle is initiated. A proper repair of the faulty component is required to permanently clear the code.

Repair costs depend on which component has failed. A replacement defrost heater typically ranges from $30 to $80 for the part, while a defrost termination sensor generally costs between $15 and $50. Adding professional labor, total repair costs often fall in the range of $100 to $250 depending on your location and the technician's rates.

Start by measuring the resistance across both terminals of the defrost heater, which is assembled directly with the evaporator coil. An open circuit reading confirms a failed heater that needs replacement. If the heater tests correctly, check the defrost termination sensor (RD-S) for proper resistance and continuity, and inspect all related wiring and connectors for damage or loose connections.

Continued use with an active r3 error can allow ice to accumulate on the evaporator coils, which will progressively reduce cooling performance and may eventually block airflow entirely. While the refrigerator is not immediately dangerous to operate, food spoilage is a real risk if cooling becomes significantly impaired. Addressing the fault promptly is recommended.