well with the heat there are 2 poss things i can think
1 you are imagining it and its not heating at all
2 the lower power element is coming on but the higher one is not
we need to figure out which
run the dryer for 5 mins or so and then stop it and put your hand on the back wall inside the drum. if its heating at all this should feel warm
if its warm then the possiblilty is the board is not turning the main element on. I would now check the relays on the board for bad solder joints
Dave