Error Code E01 indicates an open circuit in the temperature monitor. This is a fault with an internal component.
Fix:
- Unplug the air fryer from the wall outlet.
- Allow the unit to cool completely for at least 30 minutes.
- Plug it back in and see if the error code persists.
If that didn't work: If E01 (or E21) reappears, the temperature monitor has failed. Error Code E02/E22 means a short circuit in the same component. For both codes, the solution is the same: stop using the air fryer.
Contact Cosori Customer Support immediately. Do not attempt to open the unit or repair it yourself. Using a faulty appliance risks fire or electric shock.