Bella air fryer turns off by itself mid‑cycle without any error code.

Safety first: Unplug the air fryer and let it cool. Do not leave it unattended if it is shutting off unpredictably.

Basic checks:

• Ensure the unit is on a stable, level surface and the basket is fully inserted.
• Check that the vents are not blocked and that there is adequate clearance around the unit.

Internal inspection:

• Open the housing and inspect the power cord terminals, basket safety switch, and all wiring harness connectors. Reseat any loose connectors.
• Look for signs of heat damage around the high‑limit thermostat and thermal fuse.
• Gently wiggle the basket while the unit is running (if safe to do so) to see if movement causes shutoff, indicating a marginal safety switch.

If the unit consistently shuts off after a certain time and restarts after cooling, the high‑limit thermostat may be weak and opening prematurely; replace it. If shutoffs are random and not heat‑related, suspect the main control PCB or power cord connection.