Oven heats, but temperature is significantly inaccurate (too hot or too cold compared to set temperature).

Safety first: Use an oven-safe thermometer to verify temperature; avoid touching hot surfaces.

Step-by-step checks:

• Verify with thermometer: Place an accurate oven thermometer in the center of the middle rack. Preheat to 180°C (350°F) and allow 15–20 minutes to stabilize. Compare actual to set temperature.
• Check multiple points: Test at different setpoints (e.g., 150°C and 220°C) to see if the error is consistent.
• Inspect sensor placement: Ensure the sensor probe is properly mounted and not touching the oven wall.
• Control calibration: Many Haier ovens allow temperature offset adjustment in the settings menu (e.g., ±35°F). Refer to the user manual to adjust if the error is small and consistent.
• Sensor test: If the error is large or inconsistent, test the sensor resistance at room temperature and compare to spec.

When to replace parts: Replace the oven temperature sensor if readings are out of spec. If the sensor is good but calibration cannot correct the issue, the control board may need replacement.