Unox AF08

What does Unox AF08 mean?

AF08 is the fan speed error condition listed together with WF04. As an alarm it indicates the cooking chamber fan is not reaching the required speed and the oven stops, because correct air circulation is essential for safe and even cooking. It points to the fan motor, its drive or its speed feedback.

Symptoms

• AF08 shown and the oven stops
• Fan not running or running at the wrong speed
• Oven fails to start a cycle
• Alarm persists after restart

Common causes

• Fan motor failure
• Motor drive or control fault
• Speed/tachometer feedback fault
• Mechanical obstruction or seized fan
• Wiring fault to the motor or feedback

Diagnostic steps

1. 01

   Power down and inspect the fan

   Turn off the power supply and check the fan is free to turn and not obstructed or seized.

2. 02

   Check motor operation

   Verify the fan motor attempts to run and listen for it reaching speed when commanded.

3. 03

   Verify speed feedback

   Confirm the tachometer/speed feedback signal is present so the board can read the actual speed.

4. 04

   Repair or replace

   Test the motor and feedback wiring with a multimeter and replace the motor or sensor as needed.

When to call a professional

AF08 stops the oven because air circulation has failed. Diagnosing and replacing the fan motor or its feedback involves mains wiring and Unox component knowledge. Have a qualified Unox technician complete the repair rather than repeatedly restarting an oven whose fan will not reach speed.