Oven fan runs but temperature display does not increase, error related to sensor calibration on some models

Safety first: Disconnect power before accessing the sensor or control board.

• Verify with thermometer: Place an accurate oven thermometer in the center of the cavity and compare actual temperature to the set value at several points (e.g., 150°C, 180°C, 220°C).
• Check sensor mounting: Ensure the sensor probe is correctly positioned and not touching metal surfaces that could skew readings.
• Replace sensor if drifted: If readings are consistently off by more than 20–30°C and other components are fine, replace the NTC sensor.
• Calibration (if supported): Some Grundig models allow temperature offset adjustment in the settings menu. Apply a small offset (e.g., ±10–20°C) to correct minor discrepancies.

Note: Large or erratic temperature errors usually indicate a failing sensor or control board rather than a calibration issue.