Engine Warning light - any ideas?

[Polonut]

Hiya Guys
2020 Polo Match 55000. Today (hot day) engine warning light on!
Car running without any misfires, or any noises.
All levels correct.
Got home, and lifted bonnet - no visual problems - heard what sounds like a very quiet electric motor running (very low noise) rad fan not turrning.
Any immediate ideas come to mind - . When car cools down will check the fan connection. BUT will fan failure be described/included as a legitimate cause for engine light
Ideas welcomed
Thanks
C