Oven shows E14 and interior light does not work, or trips breaker when turning on.

Safety first: Turn off power and allow the lamp area to cool.

Steps to check:

• Remove the lamp cover inside the cavity (usually twists off). Inspect the bulb for blackening or broken filament.
• Replace the lamp with a Gram-compatible high-temperature oven bulb of the same wattage.
• Inspect the lamp holder for cracks or burn marks. Replace if damaged.
• From the rear, check the lamp wiring for insulation damage or contact with metal parts.
• If a new lamp blows immediately or E14 persists, the lamp circuit on the main PCB may be faulty.

Warning: Use only oven-rated bulbs; standard bulbs can explode under heat.