Display shows E3 and the Nuwave air fryer shuts down or will not start a cook cycle.

Safety First: Unplug the air fryer before inspecting the cord or opening the housing. Do not operate the unit on damaged wiring or outlets.

Step-by-step checks:

• Try a different outlet: Plug the Nuwave air fryer directly into a known-good wall outlet (no power strip or extension cord). Avoid GFCI outlets that may be tripping.
• Check household voltage (advanced): If you have a multimeter and know how to use it safely, verify that the outlet voltage is within normal range (typically 110–125 VAC in North America). Overvoltage can trigger E3.
• Inspect power cord: Examine the Nuwave power cord for cuts, kinks, burn marks, or loose prongs. If damaged, the cord set must be replaced; do not tape or splice.
• Internal inspection: With the unit unplugged and cover removed, inspect the main control board for burnt components, bulging capacitors, or scorch marks near the power input section.
• Reset and test: After moving to a proper outlet and confirming the cord is intact, plug in and attempt a short cook cycle. If E3 appears immediately, the internal power supply circuitry is likely damaged.
• Replace main board: If visible damage is present or E3 persists on a good outlet, replace the Nuwave air fryer main control board / power module.

Warning: Do not continue using the air fryer if you smell burning or see smoke from the control area. Discontinue use and seek professional service.