Unox AF08 Error Code
Fan speed error (alarm, grouped with WF04).
Source: Unox/Unox_XACC-0513-EPLM_ServiceManualAll_CommercialKitchen.pdf
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
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Diagnostic steps
Power down and inspect the fan
Turn off the power supply and check the fan is free to turn and not obstructed or seized.
Check motor operation
Verify the fan motor attempts to run and listen for it reaching speed when commanded.
Verify speed feedback
Confirm the tachometer/speed feedback signal is present so the board can read the actual speed.
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.
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Other Unox Error Codes
Motor thermal protection alarm (permanent error) — the fan motor's thermal protection has tripped.
Safety thermostat alarm — the chamber safety thermostat has tripped above its limit.
Temperature probes alarm — a cooking chamber temperature probe is damaged or disconnected.
Communication error with the power board — the control board lost communication with the power board.
Gas alarm — a fault in the gas burner/ignition system (split into multiple AF23 conditions on later software).
Wrong position of Pollo valve.
Trolley is missing.
Tank missing or safety thermostat fault.
Chamber ceiling temperature too high.
Chamber over-temperature condition (Case 1: T > 150 °C / 302 °F; Case 2: T < 150 °C).
Single-point or multi-point core probe completely damaged.
Chamber temperature probe warning.