Air fryer will not start and displays E1 on the control panel.

Safety first: Unplug the air fryer and allow it to cool completely for at least 30 minutes before any inspection. Never work on a live appliance.

Step-by-step checks:

• Power cycle: Unplug the unit for 5 minutes, then plug back in and try again. Sometimes E1 can be triggered by a transient fault.
• Inspect the cooking chamber: Remove the basket and check for burnt-on grease or debris around the heating element and temperature sensor (usually a small metal probe or stud near the heater). Clean gently with a soft brush and a damp cloth. Do not use abrasive tools.
• Check the sensor wiring (advanced): With the unit unplugged, remove the rear or top cover (screws are usually on the back or underside). Locate the temperature sensor wires leading from the cooking chamber to the main control board. Look for broken, pinched, or burned wires and loose connectors. Reseat any loose connectors firmly.
• Test continuity (for users with a multimeter): Disconnect the sensor from the board and measure resistance across the sensor leads. An open circuit (infinite resistance) indicates a failed sensor.
• If the sensor is open or wiring is damaged: Replace the high‑temperature sensor or wiring harness as a complete assembly if available for your Instant Pot air fryer model.
• If wiring and sensor test good: The main control board may not be reading the sensor correctly and likely needs replacement. This is typically a level‑5 repair; consider a professional or manufacturer service.

Do not bypass or short the thermal sensor; this is a critical safety device that prevents overheating and fire.