Oven heats but temperature is significantly too low or too high compared to the set value; no error code shown.

Safety first: Ensure the oven is installed correctly and not exposed to extreme ambient temperatures.

Step-by-step checks:

• Verify with thermometer: Place an accurate oven thermometer in the center of the cavity and compare actual temperature to the set value over several cycles.
• Adjust offset: Use the settings menu to adjust the temperature offset (if available) according to the user manual.
• Inspect sensor: Check that the NTC sensor is firmly fixed in its bracket and not touching the heating elements. Reseat its connector on the control board.
• Replace sensor: If readings are erratic or far off, replace the V-ZUG temperature sensor.

When to call a technician: If calibration and sensor replacement do not resolve the issue, the control board may require replacement.