Strong electrical or plastic burning smell from oven, even when relatively clean.

Safety first: Turn off the oven and disconnect power immediately if you smell strong burning or see smoke from control areas.

• Visual inspection: Remove the top and rear covers to inspect wiring, connectors, and the control board. Look for discolored insulation, melted plastic, or burnt PCB areas.
• Check terminal block: Inspect the mains terminal block for signs of overheating. Replace any burnt terminals and damaged wiring.
• Fan and heater connections: Ensure all high-current connections to heaters and fans are tight and not discolored. Replace overheated connectors with high-temperature types.
• Control board: If a specific component on the board is burnt or smells, replace the entire module.

Do not continue using the oven until the source of the smell is identified and repaired; fire risk is significant.