Oster air fryer powers on but immediately shows E2 and will not heat.

Safety warning: Unplug the air fryer and allow it to cool fully. Do not operate the unit if you smell burning or see smoke.

E2 commonly indicates the temperature sensor is reading an abnormal low resistance (short) or an extreme overtemperature condition.

• Cool-down reset: If E2 appeared after a long or very hot cooking cycle, let the unit sit unplugged for 30–45 minutes, then try again. Some models lock out when overheated.
• Inspect the sensor area: Remove the basket and look up toward the heating element. Check for foil, food debris, or grease buildup around the sensor probe that could cause localized overheating. Clean gently with a soft brush and mild detergent; dry thoroughly.
• Access internal wiring: Remove the rear/bottom cover to expose the heater cavity and wiring. Locate the NTC sensor near the element. Inspect for melted insulation or wires touching the metal chassis.
• Check for shorts: With a multimeter, measure resistance across the sensor leads. A reading near 0 Ω indicates a shorted sensor. Also check each lead to chassis ground; there should be no continuity.
• Reposition or replace: If the sensor is bent into direct contact with the heating element, gently reposition it back into its clip. If the sensor is shorted or heat-damaged, replace it with an Oster-compatible NTC sensor.
• Control board replacement: If the sensor and wiring test good but E2 remains, the main control board may be misreading the sensor and should be replaced.