Display shows E8 and the Nuwave air fryer will not heat properly or stops mid-cycle.

Safety First: Unplug the unit and allow it to cool before opening any covers.

Step-by-step checks:

• Reset and test: Unplug for 10 minutes, then plug back in and attempt a short cook cycle. Note if E8 appears immediately or only after heating begins.
• Locate secondary sensor (advanced): Some Nuwave models use a second NTC sensor near the air inlet or on the control board to monitor ambient temperature. With the housing removed, look for a small bead-type sensor or thermistor on a two-wire harness separate from the main cavity sensor.
• Inspect wiring: Check for pinched, cut, or burnt wires leading to this sensor. Ensure connectors are firmly seated on the control board.
• Test sensor resistance: Using a multimeter, measure resistance across the sensor leads at room temperature. Compare to the main cavity sensor; they should be in a similar range. An open or shorted reading indicates failure.
• Replace components: Replace a defective ambient/secondary NTC temperature sensor. If the sensor tests good but E8 persists, the main control board may have a failed sensor input circuit.

Note: Because this sensor helps prevent overheating, do not operate the unit with it disconnected or bypassed.