Oven does not reach set temperature or takes excessively long to preheat; may stabilize well below target.

Safety first: Disconnect power at the breaker before removing panels or touching wiring.

• Confirm actual temperature: Place an accurate oven thermometer in the center of the cavity. Preheat to 200°C (or 400°F) and compare the reading after 20–30 minutes. If the oven is more than 20–30°C (40–50°F) low, proceed with checks.
• Inspect and test bake element: Look for hot spots, discoloration, or cracks. Remove rear panel, disconnect the element, and measure resistance. Compare to specifications (typically 15–40 Ω). A significantly higher resistance or intermittent reading suggests replacement.
• Check broil/top element (if used for preheat): In some Bertazzoni models, both elements are used during preheat. Test continuity and replace if open or out of spec.
• Test temperature sensor: Measure resistance at room temperature and at a known warm temperature (e.g., 150°C if possible, using manufacturer chart). If the sensor reads higher resistance than expected, the control will underheat; replace the sensor.
• Inspect wiring and terminals: Tighten any loose spade connectors at the elements and control board. Heat cycling can loosen connections, causing voltage drop and slow heating.