Air fryer will not start; display shows E1 immediately when powered or when pressing Start.

Safety first: Unplug the Russell Hobbs air fryer from the mains and allow it to cool completely before opening any panels.

Steps to check and fix:

• Power reset: Unplug the unit for 10 minutes, then plug back in and try again. Sometimes E1 can be a transient sensor read error.
• Access the sensor: Remove the screws on the rear or bottom cover (depending on model). Carefully lift the cover to expose the heater assembly and wiring. Do not pull on wires.
• Locate the NTC sensor: On Russell Hobbs air fryers, the NTC temperature sensor is usually a small metal probe or disc clipped to the heater shroud or air channel, with two thin wires leading to the control PCB.
• Check wiring and connector: Inspect the sensor wires for breaks, burn marks, or melted insulation. Ensure the small 2-pin connector is firmly seated on the control PCB. Reseat the connector.
• Continuity test (for experienced users): With the unit unplugged, use a multimeter set to resistance. Disconnect the sensor from the PCB and measure across the two sensor pins. A typical NTC will show a resistance (often 50–200 kΩ at room temperature). If it reads open (OL), the sensor is faulty.
• Replace if faulty: If the sensor is open or physically damaged, replace it with a compatible Russell Hobbs NTC temperature sensor for your exact model. Route the new sensor wiring away from the heating element and secure it with high-temperature clips or ties.
• Reassemble and test: Refit the cover, ensuring no wires are pinched. Plug in, clear any error by power cycling, and run a short preheat cycle to confirm normal operation.

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