Display shows E9 and cooker shuts down during cooking

Safety first: Unplug the cooker immediately. Do not repeatedly reset and run the unit if E9 appears, as this may pose a fire risk.

• Visual inspection: Remove the bottom cover and inspect for burnt components, melted insulation, or a burnt smell around the heating element and control board.
• Check wiring for shorts: Look for wires that have rubbed against sharp metal edges or are touching the chassis. Repair insulation and secure wiring with high‑temperature ties.
• Test heating element to chassis: With a multimeter, check for continuity between each heater terminal and the metal chassis. Any continuity indicates a shorted element that must be replaced.
• Inspect control board: Look for cracked, burned, or bulging components on the main PCB, especially near the power input and heater triac/relay. Replace the Cosori main control board if damage is visible.
• Do not bypass fuses: If the internal fuse has blown, replace it only after identifying and correcting the root cause of the over‑current.
• Professional service recommended: Because E9 often involves high‑voltage circuitry, board‑level diagnosis and repair should be performed by a qualified technician.