E9 is displayed and the unit will not power up fully or shuts off immediately.

Safety first: Unplug the air fryer. Internal power supply components are connected directly to mains voltage; only users experienced with electronics should open the PCB area. When in doubt, contact a qualified technician.

• External checks: Confirm the wall socket works by testing another appliance. Check the air fryer power cord for cuts, burns, or kinks.
• Access the PCB: Remove the outer shell screws and carefully separate the housing to expose the main control PCB. Do not touch the underside of the board unnecessarily.
• Visual inspection: Look for a small glass or ceramic fuse on the PCB. If visibly blown (broken filament or blackened), it indicates an internal fault. Also inspect for burnt components, bulging capacitors, or scorch marks.
• Fuse replacement: Only replace the fuse with the exact same type and rating printed on the original. If the new fuse blows immediately, there is a deeper fault and further use is unsafe.
• Surge protection: If the error followed a power surge, consider using a surge‑protected outlet after repair or replacement.

Because mains‑side PCB work is hazardous, most users should opt for full main PCB replacement or professional service rather than component‑level repair.