Oven interior light not working, F18 error may appear on some models when light circuit is open

Safety first: Switch off power before changing the lamp or touching the lamp cover.

• Replace lamp: Remove the glass lamp cover inside the oven (usually twists off). Replace the bulb with the correct high-temperature oven lamp specified by Proline (same wattage and base type).
• Inspect lamp holder: Check for heat damage or corrosion on the lamp holder contacts. Replace the holder if contacts are loose or burnt.
• Check wiring: From the rear, inspect the lamp wiring for breaks or burns. Repair or replace as needed.
• Control relay: If the lamp and wiring are good but still no light and F18 persists, the lamp relay on the control PCB may be faulty. Replace the PCB if necessary.