Oven will not heat, display shows F1 shortly after a cooking program is started.

Safety first: Disconnect the oven from mains power by switching off the circuit breaker or unplugging it. Confirm power is off before removing any panels.

Steps to check the temperature sensor (NTC):

• Remove the oven from the cabinet if built-in, following the installation manual to access the rear.
• Locate the main oven temperature sensor (NTC probe) inside the cavity, usually at the rear upper area, secured with 1–2 screws.
• Remove the screws and gently pull the sensor into the cavity to access the connector, or access the connector from the rear service panel.
• Disconnect the sensor from the wiring harness.
• Using a multimeter set to resistance (ohms), measure the sensor at room temperature. A typical NTC for Liebherr ovens should read roughly 500–1200 Ω at 20–25°C (check service documentation for exact value).
• If the reading is infinite (open) or near 0 Ω (shorted), the sensor is defective and must be replaced.
• Inspect the harness from the sensor to the electronic control module (ECM) for cuts, burns, or loose pins at the control board connector.
• Install a new OEM Liebherr oven temperature sensor if faulty, route the cable away from hot surfaces, and secure it with the original clips.
• Reconnect power and test a low-temperature bake cycle to confirm the error is cleared.

When to stop: If the sensor and wiring test good but F1 persists, the electronic control module may be defective and should be diagnosed or replaced by a qualified technician.