LG air fryer displays E9 and the cooking temperature is unstable or inaccurate.

Safety first: Unplug the unit and let it cool before accessing internal components.

Steps to troubleshoot E9:

• Basic reset: Unplug the air fryer for 10 minutes to reset the control. Plug back in and test with a simple preheat.
• Check sensor mounting: Access the cavity temperature sensor from the rear. Ensure it is firmly clipped to the metal surface or properly positioned in its well so it can accurately sense cavity temperature.
• Inspect wiring: Confirm the sensor harness is not loose or partially disconnected at the main PCB.
• Compare temperature: Use an oven thermometer placed in the basket to compare actual temperature to the set temperature. Large deviations may indicate a sensor or control issue.
• Replace sensor if needed: If the sensor shows abnormal resistance or physical damage, replace it with an LG-compatible part.

Note: If replacing the sensor does not resolve E9 or temperature instability, the main control board may require replacement or firmware update by an authorized service center.