Burning plastic or electrical smell during operation, sometimes with light smoke from vents.

Safety first: Turn off and unplug the air fryer immediately if you smell burning plastic or electrical odors. Do not continue to operate until the cause is found.

Step-by-step checks:

• Visual inspection: After cooling, remove the cover and inspect wiring near the heater, terminal block, and control board for discoloration, melting, or charring.
• Check for foreign objects: Look inside the cooking chamber and around the heater for any plastic utensils, packaging, or liners that may have contacted the element.
• Tighten connections: Verify that all screw terminals and spade connectors are tight, especially on the heater and power input.
• Board inspection: Examine the main control board for burnt components or darkened areas. A burnt smell from the board usually means it must be replaced.
• Test cautiously: If you correct a loose connection or remove a foreign object, run a brief test while monitoring for any renewed odor. Stop immediately if the smell returns.

When to stop: Any sign of melted wiring or burnt PCB requires component replacement. If you are not experienced with electrical repairs, contact a professional.