Display shows E7 and the Nuwave air fryer will not start or shuts off unexpectedly.

Safety First: Unplug the air fryer before opening the control panel or touching any internal wiring.

Step-by-step checks:

• Power cycle: Unplug the unit for at least 10 minutes to allow capacitors to discharge. Plug back in and see if E7 clears.
• Dry out moisture: If the air fryer was recently cleaned with excessive water or used under a range hood with heavy steam, let it sit unplugged in a dry, warm area for 24 hours, then retest.
• Inspect control connections (advanced): Remove the control panel cover and locate the ribbon cable or harness connecting the display/touch board to the main power board. Ensure all connectors are fully seated and free of corrosion.
• Look for damage: Check both boards for burnt components, cracked solder joints, or signs of liquid damage.
• Replace faulty board: If reseating cables and drying the unit does not clear E7, replace the main control board. In some cases, the display/touch control board may also need replacement if it shows visible damage.

Note: Firmware updates for Nuwave air fryers are generally not user-serviceable; board replacement is the typical remedy for persistent E7 errors.