The display shows H1 or a similar code, and the unit overheats or cycles erratically, sometimes reaching very high temperatures.

Safety first: Unplug the air fryer immediately. Do not continue using the unit until it has been repaired, as there is a fire risk.

• Step 1 – Allow cooling: Let the unit cool completely before opening it.
• Step 2 – Inspect heater wiring: Remove the cover and check for any obvious shorts where heater wires might be touching the chassis or bypassing the relay.
• Step 3 – Examine control board: Inspect the main control board for burnt areas around the heater relay or power devices. A welded relay may show heat discoloration.
• Step 4 – Replace board: Replace the main control board if any signs of damage are present or if the heater energizes as soon as the unit is plugged in.
• Step 5 – Verify safety devices: After repair, confirm that the high-limit thermostat and thermal fuse are intact and correctly mounted.

Warning: Do not attempt to mechanically free a welded relay and continue using it; always replace the board.