Display shows H0 or HO and the unit will not start heating.

Safety first: Unplug the air fryer and allow it to cool completely. Overheat conditions can be a fire risk; inspect carefully.

Cleaning and reset:

• Deep clean: Remove basket and drawer. Clean all accessible surfaces, including heater guard and fan intake, to remove grease and carbon buildup.
• Ventilation: Ensure the unit is used on a hard, heat-resistant surface with clear airflow around all vents.

Thermal device check (advanced):

• Access heater assembly: Remove bottom/rear covers to expose the heater and attached thermal devices.
• Locate thermal fuse: Identify the inline thermal fuse (often wrapped in fiberglass sleeve) and any disc thermostats mounted to the heater bracket.
• Test continuity: With a multimeter, check continuity through the thermal fuse and thermostats. Any open device must be replaced with the same temperature and current rating.
• Inspect for overheating: Look for darkened metal, melted insulation, or warped plastic near the heater. Excessive damage indicates the unit may not be safe to repair.

Reassembly: After replacing failed thermal components and cleaning, reassemble and test. If H0 persists, the control board may be latched in a fault state and require replacement.