E7 appears intermittently, often when the unit is first plugged in or after a power cut.

Safety first: Unplug the air fryer before inspecting the power cord or internal wiring. Mains voltage is hazardous.

• Check the outlet: Test the fryer on a different known‑good outlet, preferably on a separate circuit from heavy loads (kettles, toasters). Avoid extension leads or multi‑way adapters.
• Inspect the power cord: Look for cuts, kinks, or burn marks along the cord. If damaged, the cord set should be replaced.
• Internal cord connection: With the unit unplugged and cover removed, verify that the mains cord strain relief is secure and that the live/neutral connections to the terminal block or control board are tight.
• Signs of board damage: Examine the control PCB around the input section for burnt components, cracked solder joints, or bulging capacitors. If present, the board should be replaced rather than repaired in‑home.
• Professional service: Because this fault involves mains and power electronics, if E7 persists after basic checks, contact a qualified technician or Sage support.