Air fryer will not start; display shows E1 immediately after power-on or when pressing the start button.

Safety first: Unplug the Xiaomi air fryer from the wall outlet and let it cool completely before opening any covers. Do not work on the unit while it is connected to power.

Step-by-step checks:

• Power-cycle the unit: Unplug for 5 minutes, then plug back in and try again. Sometimes E1 can be a transient sensor reading error.
• Inspect the sensor harness: Remove the basket and drawer. On most Xiaomi air fryers, the NTC temperature sensor is mounted near the heating element at the top of the cooking cavity. Remove the top cover (usually several Phillips screws on the back and underside). Locate the small two-wire cable (often white or gray) running from the cavity to the main control board.
• Check for loose or damaged wiring: Ensure the sensor plug is fully seated on the main PCB header. Look for broken insulation, pinched wires, or burn marks. Reseat the connector several times to clean light oxidation.
• Visual check of the NTC sensor: The sensor is usually a metal probe or small bead sensor fixed to the inner metal liner near the heater. Confirm it is firmly attached and not physically broken or hanging loose.
• Basic resistance test (for experienced DIYers with a multimeter): With the unit unplugged and the sensor disconnected from the board, measure resistance across the two sensor leads. At room temperature, most Xiaomi NTCs read between 50kΩ–100kΩ. A reading of 0Ω (short) or infinite (open) indicates a failed sensor.
• Reassemble and test: If wiring and sensor look good, reassemble the top cover, plug in the unit, and test. If E1 persists, the sensor or main board is likely defective.

When to replace parts: If the sensor is open/shorted or physically damaged, replace the NTC temperature sensor assembly. If a known-good sensor still triggers E1, the main control board sensor input is likely faulty and the board should be replaced by a qualified technician.