Dpf regen? Take it for a long drive.
It's because the car was trying to do a DPF regen. That gets the engine very hot , so if it's interrupted then the fan has to stay on to cool things down.
You need to go on a 15-20 min drive once the engine is warm and keep it at a steady 2-2.5k revs at >40mph.
Don't worry about the fan,when or if it needs to regenerate the D P F filter the warning light comes on the dash then go for a blast.
That's what i mean by giving it a blast take it on the motorway and have a bit of "fun" The light came on my FR a few weeks ago i took it on the motorway.There is a VW video on utube.