Air fryer overheats; food burns quickly and there is a strong smell of burning plastic or oil, but no error code is displayed.

Safety first: Unplug the fryer immediately if you smell burning. Allow it to cool and inspect for melted plastic or scorched wiring.

Steps:

• 1. Clean grease buildup: Heavy grease can ignite or smoke at normal temperatures. Thoroughly clean the basket, pan, and cavity surfaces.
• 2. Verify temperature: Place an oven thermometer in the basket and run the fryer at a moderate setting (e.g., 160°C). If the actual temperature is much higher than the setpoint, there is a regulation issue.
• 3. Inspect NTC sensor: Open the housing and locate the temperature sensor. Ensure it is firmly attached to its bracket and not touching the heating element directly. Reattach or reposition as needed.
• 4. Check heater relay: On the control board, inspect the heater relay contacts. A welded relay can keep the heater on continuously. Replace the control board if the relay is stuck closed.
• 5. Test high-limit thermostat: If equipped, verify that the high-limit thermostat opens at its rated temperature (requires controlled heating and a multimeter). Replace if it fails to open.
• 6. Replace faulty components: Replace the NTC sensor, thermostat, or control board as indicated by your tests.
• 7. Test carefully: After repair, run short test cycles while monitoring temperature and smell. Keep a fire extinguisher rated for electrical/grease fires nearby.

Warning: Do not continue using an air fryer that repeatedly overheats; this is a serious fire risk.