F13 error, often related to steam or combination-steam AEG ovens; oven stops steam function.

Safety first: Disconnect power and allow the appliance to cool. Steam components can remain very hot.

• Descale steam system: Run the manufacturer-recommended descaling program using the correct descaling agent. Heavy limescale can cause overheating and sensor errors.
• Check water tank and lines: Ensure the water tank is correctly seated and filled, and that inlet filters are not blocked.
• Sensor and element test: Access the steam generator module (usually on the side or top). Measure resistance of the boiler element and NTC sensor. Replace any open-circuit components with AEG-specific parts.
• Inspect wiring: Check connectors between the steam module and main control board for corrosion or loose fit.

Warning: Steam ovens combine water and electricity; improper repair can be dangerous. Consider professional service for boiler-related faults.