Refrigerator displays incorrect temperature readings compared to a thermometer.

Safety first: Unplug the refrigerator before accessing sensors or the control board.

• Verify with accurate thermometer: Place a reliable thermometer in a glass of water in the refrigerator and compare after several hours.
• Inspect thermistor placement: Ensure the refrigerator thermistor is properly clipped to the liner or in its housing, not dangling or touching cold air outlets.
• Replace thermistor: If readings are consistently off and other causes are ruled out, replace the refrigerator thermistor.
• Control board: Persistent misreading after sensor replacement may indicate a faulty main control board, requiring professional diagnosis.