H2 appears and the unit shuts down or refuses to start a new cycle until cooled.

Safety first: Unplug the air fryer and allow at least 30 minutes for cooling before further inspection.

• Allow cool‑down: Many Swan models will display H2 if the internal temperature is above a safe threshold. Leave the basket open and the unit unplugged to speed cooling.
• Check for obstructions: Inspect rear and side vents for obstructions such as walls, curtains, or other appliances. Maintain at least 10 cm clearance.
• Clean exhaust path: Remove grease buildup from the exhaust grill using a soft brush and mild detergent. Ensure it is fully dry before use.
• Sensor and thermostat check: If H2 appears even when the unit is cold, the NTC sensor or high‑limit thermostat may be faulty. Inspect their mounting and wiring as described in other entries.

If the error occurs frequently under normal use, have a technician verify the calibration of the thermostat and sensor, and inspect the main PCB control logic.