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

Safety first: Unplug the Crux air fryer and let it cool completely for at least 30 minutes before opening the housing. Never work on the unit while it is connected to power.

• Power reset: Unplug the fryer for 5–10 minutes, then plug back in and try again. Sometimes E1 can be a transient logic error.
• Check the sensor connector: Remove the outer shell according to the user manual. Locate the small two-wire NTC temperature sensor clipped near the heating element or in the air channel. Ensure its plug is firmly seated on the main control PCB and not discolored or melted.
• Inspect sensor wiring: Follow the two thin wires from the sensor to the board. Look for cuts, burns, or broken insulation, especially where the harness passes near the heater or fan shroud. Repair minor damage with high-temperature wire and heat-shrink, or replace the harness.
• Test the sensor (for advanced users): With the unit unplugged, disconnect the sensor from the board and measure resistance with a multimeter. A typical NTC sensor will read between ~5–200 kΩ at room temperature (exact value varies by model). If the meter shows OL (open) or 0 Ω (short), the sensor is defective.
• Replace the NTC sensor: If open or physically damaged, remove the retaining clip or screw, install a compatible Crux NTC temperature sensor, route the wires away from the heater, and reconnect to the PCB.
• If E1 persists: The sensor input circuit on the main control PCB may be faulty. Replacement of the control board is recommended and is best done by a qualified technician.