Miele Refrigerator Error Code F3

F3 indicates that the freezer air NTC temperature sensor has been detected as defective, either short-circuited or open-circuited. Because the control board can no longer read a valid temperature from the freezer, it defaults to running the compressor continuously. The fault requires testing the sensor resistance against the NTC resistance table and replacing the sensor if it is out of specification.

Short-term use may be possible, but running the compressor continuously puts extra wear on the compressor and can lead to excessive frost buildup or over-freezing of food. The freezer temperature is also not being accurately monitored, so food safety cannot be guaranteed. It is best to address the fault promptly rather than relying on the appliance in this condition.

A power reset may temporarily clear the F3 code from the display, but the error will return as soon as the control board checks the NTC sensor again and detects the same fault. Because F3 is triggered by a hardware failure in the sensor or its circuit, the underlying problem must be repaired before the code will stay cleared.

A knowledgeable DIYer with a multimeter can test the NTC sensor resistance and compare it to the rated values for the unit. If the wiring and connectors check out and the sensor itself reads outside the expected resistance range, replacing the NTC sensor is a straightforward repair. However, accessing the sensor may require partial disassembly of the freezer interior, so comfort with appliance repair is recommended before attempting this yourself.

If the NTC sensor itself is the problem, parts costs for a replacement thermistor are typically in the range of $20 to $80 depending on the specific model. If a technician is needed for diagnosis and replacement, total repair costs including labor generally fall in the range of $100 to $250. Wiring or connector issues may cost less if no parts are needed.