Display shows E3 during preheat or cooking; unit stops heating and may shut down.

Safety first: Unplug the air fryer and allow it to cool for at least 30 minutes. Surfaces and internal components may be very hot.

Steps to resolve E3:

• 1. Check ventilation: Ensure the Proscenic air fryer has at least 10 cm (4 in) clearance on all sides and is not placed under cabinets or against walls. Clear any obstructions from the rear and side vents.
• 2. Clean the air passages: Remove the basket and drawer. Clean grease and food debris from the basket, drawer, and interior cavity. Use a soft brush or vacuum around the rear and bottom vents to remove dust buildup.
• 3. Verify fan operation: Plug the unit in, start a low-temperature cycle, and listen for the internal fan. You should hear a steady airflow sound. If the fan does not run, unplug the unit and inspect the fan motor and wiring (see fan-related entries).
• 4. Inspect the temperature sensor: Access the sensor near the heater. Check that it is firmly attached and not bent away from the airflow path. A sensor that is loose or touching the heater can read excessively high temperatures. Reseat or reposition as needed.
• 5. Check for stuck relay (advanced): With the unit unplugged, inspect the main PCB for a heater relay that appears burnt or welded. If the heater remains on continuously when powered, the relay may be stuck closed and the board should be replaced.
• 6. Test again: After cleaning and inspection, reassemble and run a short preheat at a moderate temperature. If E3 recurs quickly, the sensor or main board may be faulty and should be replaced.

Warning: Do not cover the top or rear vents during operation. Overheating can damage internal plastic parts and pose a fire risk.