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Error code reference

Miele Refrigerator Error Code F112

SmartFresh NTC faulty (resistance corresponds to temperature below -66°F/-55°C or above 140°F/60°C).

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SmartFresh NTC faulty (resistance corresponds to temperature below -66°F/-55°C or above 140°F/60°C).

First step from the service manual

Replace SmartFresh NTC.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What F112 means on a Miele refrigerator

F112 is a temperature sensor fault code for the SmartFresh compartment NTC (Negative Temperature Coefficient) thermistor. The SmartFresh zone is a dedicated drawer or compartment in select Miele refrigerators designed to maintain precise humidity and temperature conditions for produce preservation. The NTC thermistor is a resistive sensor whose resistance changes predictably with temperature, allowing the control board to calculate the compartment's actual temperature. When the resistance value reported by this sensor falls outside the range corresponding to temperatures between -66°F (-55°C) and 140°F (60°C), the control board interprets the reading as a sensor fault and triggers code F112.

The fault boundary conditions are significant: a reading below -66°F (-55°C) in resistance terms typically indicates an open circuit in the sensor or its wiring harness, while a reading above 140°F (60°C) in resistance terms typically indicates a short circuit to ground. Both conditions produce sensor output that cannot represent any realistic operating temperature for the compartment, making the reading unusable for temperature regulation.

Because the control board cannot trust temperature data from a faulty SmartFresh NTC, the appliance may disable or alter operation of that compartment to prevent damage to stored food. The primary diagnostic action is direct replacement of the SmartFresh NTC, though wiring continuity and connector integrity should be confirmed before assuming the sensor itself has failed internally.

Source: manufacturer service documentation.

Common causes of F112

  1. 01

    Failed SmartFresh NTC thermistor

    Part replacement

    The NTC sensor itself has failed internally, producing a resistance value outside the valid operating range. This is the most common root cause and is confirmed by measuring the sensor's resistance directly with a multimeter and comparing it to expected values for the ambient temperature.

  2. 02

    Open circuit in sensor wiring harness

    Wiring / connection

    A broken wire or corroded connection between the SmartFresh NTC and the control board causes the circuit to read as infinitely high resistance, which the board interprets as a temperature below -66°F (-55°C). Inspect the wiring harness along its entire length for breaks, chafing, or corrosion at connectors.

  3. 03

    Short circuit in sensor wiring

    Wiring / connection

    A wire shorting to ground or to another conductor forces the resistance reading abnormally low, producing an apparent temperature above 140°F (60°C). Check the harness routing for areas where insulation may have worn against a metal edge or pinch point.

  4. 04

    Loose or corroded connector at control board or sensor

    Wiring / connection

    Intermittent or high-resistance connections at the sensor plug or the control board header can produce out-of-range resistance readings without a complete wire break. Disconnect, inspect, and reseat all connectors in the SmartFresh NTC circuit.

  5. 05

    Faulty main control board

    Part replacement

    If the NTC sensor and all associated wiring test within specification, the control board input circuit may be damaged and unable to correctly interpret the sensor signal. This is the least likely cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about F112

What does F112 mean on a Miele refrigerator?
F112 indicates that the SmartFresh compartment NTC temperature sensor is reporting a resistance value that falls outside the range corresponding to any valid operating temperature, specifically below -66°F (-55°C) or above 140°F (60°C). The control board cannot use this data to regulate the SmartFresh zone, so it flags the fault. The cause is typically a failed sensor, a broken wire, or a faulty connection in the sensor circuit.
Can I fix the F112 error myself, or do I need a technician?
A knowledgeable DIYer comfortable with using a multimeter can check the wiring harness and connectors for visible damage or continuity faults. However, sourcing and replacing the correct SmartFresh NTC sensor requires identifying the specific part for your Miele model, and improper handling of refrigerator components can cause additional faults. If wiring checks do not reveal an obvious problem, professional service is recommended to avoid misdiagnosis.
Is it safe to keep using my refrigerator while F112 is active?
The SmartFresh compartment may not maintain its intended temperature and humidity conditions while this fault is active, which means produce stored in that zone may not be preserved as effectively. The main refrigerator and freezer compartments are typically controlled by separate sensors and should not be directly affected. It is best to avoid storing perishables in the SmartFresh drawer until the fault is resolved, but the overall appliance is generally not a safety hazard.
How much does it cost to repair the F112 error on a Miele refrigerator?
If only the SmartFresh NTC sensor needs replacement, parts costs are typically in the range of $20 to $80 depending on the specific Miele model, with labor adding $75 to $200 or more depending on your location and the service provider. If the fault is traced to the main control board, parts alone can range from $150 to $400 or higher. Getting a diagnostic visit from a Miele-authorized service technician will give you a precise estimate before committing to repair.
Will resetting the refrigerator clear the F112 error code?
A power reset may temporarily clear the fault display, but the code will return if the underlying sensor or wiring problem has not been corrected. The control board continuously monitors the SmartFresh NTC resistance and will re-trigger F112 any time the reading falls outside the valid range. A reset is useful for confirming whether the fault is intermittent, but it is not a repair solution.

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