Dryer shows F13; drum light or internal illumination may not work correctly.

Safety first: Disconnect power before working on the light or door area.

• Check the bulb or LED: If your Liebherr dryer uses a replaceable bulb, remove the cover and inspect the bulb. Replace if filament is broken or glass is darkened. For LED modules, inspect for burn marks.
• Inspect door switch: Some models use the door switch to control the drum light. Test the switch for proper operation and continuity on the light contacts.
• Check wiring: Trace the wires from the light to the control board. Look for pinched, cut, or burnt wires and repair as needed.
• Test after replacement: After replacing the bulb or LED module, restore power and check if F13 clears. If the error persists, the control board's light circuit may be faulty.