Air fryer displays H1 and will not start; sometimes appears after long continuous use.

Safety first: Turn off and unplug the air fryer. Allow it to cool for at least 30–45 minutes.

Steps to resolve:

• Allow full cool-down: Leave the basket drawer open to help heat escape. Do not run the unit continuously beyond the recommended duty cycle in the manual.
• Check ventilation: Ensure the air fryer is not placed under cabinets or against walls that block the top and rear vents.
• Clean vents and interior: Use a soft brush or vacuum to remove dust and grease from the exhaust vents. Wipe the interior surfaces and the area around the temperature sensor.
• Test after cool-down: Once completely cool, plug in and try again. If H1 clears, monitor for recurrence; frequent H1 errors indicate poor ventilation or failing thermal components.

Advanced checks:

• If H1 appears even when the unit is cold, the overheat thermostat may be stuck closed or the sensor may be misreading. Inspect and test the thermostat and sensor as described in other entries.