Dryer will not heat and the timer will not move

Dryer Repair
1

my dryer will not heat and the timer does not move, 3 hrs later my clothes were still wet and the timer never moved off the setting that i had put it on what could be wrong and what part(s) shoud i get

2

dryer will not heat and timer does not move

3

you need a heat element or a thermal the timer wont advance because it is thermastat controled and untill the thermastat opens it doesn’t put power to the timer motor

4

ok how will we know which one it is, the dryer still runs but blows all cold air..