From the printer's menu Settings -> Temperature -> Nozzle, set the nozzle temperature to 80°C

Return to the info screen (main screen)

Verify that the hotend fan is starting as soon as the temperature exceeds 50°C

Let the hotend cool down using the printer's menu Preheat -> Cooldown

If this test fails, do not attempt to print or use your printer. Carefully verify carefully the wiring of your hotend