When you go to: C --> KRC --> MADA --> STUE, can you tell us what the value is for the fan_follow_up_time?
With default settings the value is 1000 so the fan turns all the time. But when the connectors on the power supply are changed it is possible to change this value so the fan will only work when necessary.
I guess that this value is 15 (15 minutes) so you can change this value into 5. So it will only work for 5 minutes.
I don't think you can change it into "0" but you can try...
Good luck