Display shows H03 and the air fryer does not heat properly or stops mid-cycle.

Safety first: Unplug the appliance and allow it to cool fully before inspection.

• Visual inspection of heater area: Remove basket and pan. With a flashlight, inspect the heating element area for burnt spots, melted insulation, or carbonized grease. Clean gently with a damp cloth if only surface grease is present.
• Smell for burning: If you previously noticed a burning plastic or electrical smell, discontinue use; this strongly suggests a heater or wiring fault.
• Reset: After cooling and cleaning, plug in and attempt a short cycle. If H03 appears again quickly, the heating circuit likely has an electrical fault.
• Do not bypass protection: Do not attempt to bridge fuses or relays; this can cause fire.

Warning: Diagnosing heater overcurrent requires measuring resistance and insulation of the heating element and checking the control PCB. This is advanced work; contact a professional technician.