Oven display shows F02 and heating stops, often shortly after starting a program

Safety first: Isolate the oven from mains power before removing any panels or touching internal wiring.

Step-by-step checks:

• 1. Locate the temperature sensor: On most Zanussi ovens, the sensor is a small metal probe protruding from the rear or top of the oven cavity, secured with 1–2 screws.
• 2. Inspect the sensor and wiring: Remove the rear cover. Follow the sensor wires to the connector on the main PCB. Check for burnt, cut, or pinched wires and loose connectors. Reseat the connector.
• 3. Measure sensor resistance: Disconnect the sensor plug and measure resistance with a multimeter. At room temperature (20–25°C), most Zanussi NTC sensors read roughly 500–1100 Ω (check service data if available). An open circuit (OL) or near 0 Ω indicates a faulty sensor.
• 4. Check continuity of harness: If the sensor tests OK, check continuity from the sensor connector to the PCB connector to rule out a broken wire.
• 5. Replace faulty component: If the sensor is out of spec, replace it with a genuine Zanussi oven temperature sensor. If wiring and sensor are good but F02 remains, the main control board sensor input is likely defective and the board should be replaced.

Warning: Do not operate the oven with a bypassed or shorted sensor; this can cause overheating and fire risk.