While primarily an analogue model, if you have a digital variant (FRX 460 JN/JB digital), you can often unlock the panel by holding the "Start" and "Stop" buttons for 3–5 seconds.
Warning: Avoid sites requiring credit card information for a "free manual." The official Nardi manual is a PDF, not a paid subscription.
Ensure you are using the correct rack level (usually level 2 or 3 for baking) and that the fan is not obstructed by oversized trays.