Hygena AE6BMS Fan Oven Has stopped working no heat or light but time panel ?

The first thing I noticed was a lot of smoke coming from the top of the oven but no smell of burning,next time I used it The oven light started flickering but it still had heat to cook an hour later same thing but no heat so I turned it of and back on this time no
Fan no light no heat yet the the time display panel is still working so I know it's got power, it's a 14 months old just out of the years guarantee the thing is I want to repair it because am moving home and I don't want to buy new one if I can repair so the new owners have an oven till there remodel the kitchen