Bella digital air fryer shows E3 during preheat and stops heating.

Safety first: Unplug the air fryer before inspecting the cord or opening the housing. Do not use the unit on damaged outlets or extension cords.

External checks:

• Verify the air fryer is plugged directly into a properly grounded wall outlet. Avoid power strips and long extension cords.
• If possible, test the outlet with another high‑wattage appliance or a plug‑in voltage tester to confirm normal voltage (typically 110–125V AC in North America).
• Try a different outlet on a separate circuit to rule out wiring issues.

Internal checks (advanced):

• With the unit unplugged, remove the rear or bottom cover to access the power cord entry and control board.
• Inspect the power cord strain relief and terminal connections for looseness, discoloration, or burning. Tighten any loose spade connectors.
• Examine the main control PCB for burnt components, especially near the AC input, rectifier, and MOV (surge protector). Any charred or cracked parts indicate board failure.
• If the cord is nicked, cut, or heat-damaged, replace the power cord assembly.

If E3 continues on multiple outlets and there is no visible cord damage, the main control PCB power sensing circuit is likely faulty and the board should be replaced rather than repaired at component level by a typical DIYer.