E4 appears on the display and the unit shuts off or will not start.

Safety first: Disconnect the air fryer from power before inspecting cords or internal wiring.

• Check power source: Plug the Gourmia air fryer directly into a properly grounded wall outlet. Do not use extension cords, power strips, or surge protectors while testing.
• Verify voltage (advanced): If you have a multimeter and know how to use it safely, measure the outlet voltage. It should be within the range specified on the air fryer rating label (typically 110–120V or 220–240V depending on region).
• Inspect power cord: Examine the Gourmia power cord for cuts, kinks, or burn marks. If damaged, replace the power cord assembly rather than attempting to repair it.
• Internal connector check: With the unit unplugged and cover removed, inspect the AC input connector on the main control board. Ensure the plug is fully seated and there are no signs of arcing or heat damage.
• Control board replacement: If the power source is correct and wiring is intact but E4 persists, the power supply circuitry on the main control board may be defective. Replace the main control board with a compatible Gourmia part.
• Re-test: Reassemble, plug in directly to the wall outlet, and test operation. If E4 reappears and household voltage is normal, discontinue use and consult a qualified technician.