Air fryer overheats and burns food even at low temperature settings

Fire Risk: Unplug the unit immediately if it smokes excessively or shows signs of melting plastic. Do not leave the air fryer unattended while testing.

• Step 1 – Verify settings: Confirm that the temperature and time are set correctly and that you are not using a preheat or high‑temp preset unintentionally.
• Step 2 – Check sensor placement: With the unit unplugged, locate the temperature sensor inside the cavity or near the heater. Ensure it is properly mounted and not touching the heating element directly.
• Step 3 – Test sensor: Measure the resistance of the NTC sensor at room temperature and compare to specifications if available. A shorted sensor will cause the unit to overheat.
• Step 4 – Inspect control board: If the sensor is good, the heater relay on the control board may be stuck closed, keeping the heater on continuously. Replace the control board if the relay is welded or burnt.
• Step 5 – High-limit thermostat: Test the high‑limit thermostat for proper operation. If it never opens even at high temperatures, replace it.