Oven does not reach set temperature, display shows F3 after some time in a heating program.

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

Element inspection:

• Visually inspect the lower (bake) and upper (grill) heating elements inside the cavity for blisters, cracks, or burn marks.
• Remove the rear panel (or internal covers) to access the element terminals.
• Disconnect one wire from each element and measure resistance with a multimeter. A typical element will read between 15–60 Ω depending on power rating.
• If an element reads open circuit (OL), it is defective and must be replaced with a Liebherr-compatible element.

Wiring and relay check:

• Inspect wiring from the elements to the power board for heat damage or loose spade connectors.
• Check the terminal block where mains power enters the oven for signs of overheating or loose screws.
• If elements and wiring are good, the heating relay on the control board may be faulty; replacement of the control module is usually required.

After replacing any faulty parts, reassemble, restore power, and test a standard bake cycle to confirm normal heating.