Air fryer powers on but quickly shows E4 and shuts off.

Safety first: Unplug the unit before inspecting the cord or internal wiring. Do not operate the air fryer on an unstable or questionable outlet.

• Check outlet: Plug another small appliance into the same outlet to verify stable power. If lights flicker or the other appliance behaves oddly, have an electrician inspect the circuit.
• Avoid extension cords: Plug the air fryer directly into a properly grounded wall outlet. Undersized extension cords can cause voltage issues.
• Inspect power cord and inlet: With the unit unplugged, check the cord for cuts, kinks, or burn marks. Remove the rear cover to inspect the power inlet and strain relief. Tighten any loose spade connectors and replace damaged wiring.
• Surge history: If E4 appeared after a power surge or outage, the low‑voltage power supply on the main control board may be damaged. Look for swollen capacitors or burn marks on the board.
• Board replacement: If the outlet and cord are good but E4 persists, replace the main control board, as the internal power regulation circuit is likely faulty.