Miele Freezer Error Code F122

F122 indicates that the ambient air NTC sensor is faulty. The control board has detected a resistance value from this temperature sensor that corresponds to a temperature below -66°F (-55°C) or above 140°F (60°C), which is outside the sensor's valid operating range. This points to a failure in the sensor itself or in its wiring circuit rather than an actual extreme temperature condition.

A failed ambient air NTC means the control board is not receiving valid information about the surrounding temperature, which can affect how the freezer manages its operation. Continuing to run the appliance with this fault active is not recommended, as it may lead to improper temperature regulation. Check your frozen food temperatures and arrange for repair promptly.

Resetting the appliance may temporarily clear the F122 code from the display, but if the underlying cause, such as a failed NTC sensor or damaged wiring, has not been addressed, the fault will return once the control board runs its diagnostic checks again. A reset is not a fix and should not be used as a substitute for identifying and repairing the faulty component.

A knowledgeable DIYer can inspect the wiring and connector associated with the ambient air NTC for obvious damage, corrosion, or loose connections without specialized tools. However, confirming the sensor has failed and replacing it correctly requires identifying the right component and safely accessing the sensor location. If you are not comfortable working with appliance wiring and components, having a qualified technician perform the repair is the safer option.

If only the ambient air NTC sensor needs replacement, parts typically range from around $20 to $80 depending on the specific model, with labor costs adding $80 to $200 or more depending on your location and the service provider. If the fault turns out to involve the control board, costs will be higher. Getting a diagnostic assessment from a Miele-authorized technician will give you the most accurate estimate for your specific unit.