Miele Refrigerator Error Code F122

F122 indicates that the ambient air NTC sensor is reporting a resistance value corresponding to a temperature below -66°F (-55°C) or above 140°F (60°C). These readings are outside any realistic operating condition, so the code points to a faulty sensor rather than an actual extreme temperature. The ambient air NTC monitors the room-temperature environment around the refrigerator to help regulate cooling performance.

With a faulty ambient air NTC, the refrigerator loses the ability to accurately factor room temperature into its cooling calculations, which can affect efficiency and long-term performance. While the unit may continue to cool in the short term, it is best to address the fault promptly to avoid potential food safety issues caused by inconsistent temperature control.

A reset may temporarily clear the displayed error, but F122 will return as long as the ambient air NTC sensor continues to report an out-of-range resistance value. The underlying fault in the sensor, wiring, or connector must be repaired before the code will stay cleared permanently.

A knowledgeable DIYer comfortable working with appliance wiring can inspect the sensor connector and wiring harness for obvious damage or loose connections. However, identifying and replacing the correct ambient air NTC sensor requires sourcing the right part for your specific Miele model, so many owners prefer to have a qualified technician handle the repair to avoid errors.

Repair costs depend on whether the fault is a simple connector issue or a full sensor replacement, plus whether you use a Miele-authorized technician. Parts alone for an NTC sensor typically fall in the range of $20 to $80, while a service call with labor can bring the total to $100 to $250 or more depending on your location and the technician's rates.