Air fryer stops mid-cycle and displays E3; unit feels excessively hot.

Safety first: Unplug the air fryer and let it cool for at least 30 minutes. Do not touch internal metal parts while hot.

Steps to address E3:

• 1. Check ventilation: Ensure the air fryer has at least 5 inches (12 cm) of clearance on all sides and is not pushed against a wall or under low cabinets. Clear any obstructions from the rear and bottom vents.
• 2. Clean intake and exhaust vents: Use a soft brush or vacuum to remove dust, grease, and crumbs from all vents. Blocked airflow can cause overheating and trigger E3.
• 3. Inspect fan operation: Start a short cycle and listen for the fan. If the fan is not running or is very weak, the unit can overheat. See fan-related entries for further diagnosis.
• 4. Check temperature sensor placement: If accessible, verify the NTC sensor is properly clipped in place and not touching the heating element directly, which can cause false high readings.
• 5. Examine thermal cutoff devices: Many Insignia air fryers include a thermal fuse or thermostat near the heater. If the fuse is partially damaged, it may cause erratic overheating behavior. Test continuity with a multimeter and replace if out of spec.
• 6. Control board relay check (advanced): If the heater relay on the main control board is stuck closed, the element may stay on too long. Look for signs of burning or pitting on the relay. If suspected, replace the main control board.

Warning: Never bypass thermal fuses or thermostats. They are critical safety components.