Hoover TC650 heating element stays on when you stop the dryer ?

Hi Can anyone help me my TC650 dryer is having problems !
First of all there was a smell of burning and then the filter light came on, this has happened before so I new what caused it,so I replaced the thermal fuse with the new one and that worked as the element came on and started to heat up but when i was checking it was all working fine I noticed that when i opened the door the element was still on and glowing very hot, so I unplugged it before it blew another thermal fuse can anyone help me please.