Air fryer powers on but shows E4 and shuts down when a cooking cycle is started.

Safety first: Unplug the unit before any disassembly. Allow it to cool.

Steps to address E4:

• 1. Check placement and environment: Ensure the air fryer is not placed against a wall, under low cabinets, or near other heat sources (stove, oven). Ambient temperature should be below 35°C (95°F).
• 2. Inspect exterior vents: Clean dust and grease from all side, rear, and bottom vents using a soft brush or vacuum. Blocked vents can cause the internal control area to overheat.
• 3. Power reset: Unplug for 10–15 minutes to allow any internal thermal protection to reset, then test again.
• 4. Access control board area: If E4 persists, remove the rear or top cover (depending on model) to expose the main control PCB. Look for a small sensor or thermistor mounted near the board or on a heat sink.
• 5. Check sensor connection: Ensure the sensor connector is fully seated on the board and that the wires are not pinched or damaged. Reseat the connector.
• 6. Inspect the PCB: Look for burn marks, swollen capacitors, or cracked solder joints around power components. If the board shows damage or if the sensor is integrated into the PCB, replace the main control PCB.

If the unit continues to show E4 after cleaning and inspection, professional diagnosis is recommended.