KAZE MASTER ACE: "CPU-Fan Error!"

[mummin]

The KAZE MASTER ACE KM02-SL-3.5 is working fine -and looking good - but every time i boot, system stops with message: "CPU-Fan Error! Press F1 to resume" . I checked all BIOS settings but everything is OK, no settings to avoid this message.
Independent from fan-speed setting. Even when i turn to full speed/Voltage before booting, same problem.
Board is ASUS P5K, CPU-Fan is 3-pin, was at the 4-pin Board-controller for CPU-Fan before.
What can i do to boot without pressing F1 always?

[Oli]

Go into P5K BIOS, choose hardware monitoring, choose CPU fan speed (the line where the actual RPM are shown!), press ENTER - set it to "IGNORE".

[mummin]

Thank you Oli, that's it!
Danke für die schnelle Hilfe.

[Oli]

Wenn man langsam drehende Lüfter einsetzt, ist man diese Art Kummer mit Asus-Boards gewohnt.