How to fix the convection fan on samsung oven model BT62CDBST?

Hi there, would there be anybody out there that could help me please, I have a samsung oven model no.BT62CDBST, & the convection fan stays on even after I turn it off,
I have tried pulling the main power for a few days then turn the power back on only to find the fan still on, I have a good feeling that it's only something minor but I can't pin point it so I can fix it, would there be anybody out there that could offer some help so I can get this sorted, if be grateful
Thank you